DE521519C - Weft thread cutting device for gripper looms - Google Patents

Description

Weft thread cutting device for gripper looms There are weft thread cutting devices known to pass through the warp threads to cut the weft thread.

In the previously known devices of this type, the weft thread entered by the gripper as a loop in the compartment before the cutting device is brought into the working position. To cut the weft thread occurs Cutting device through the warp threads, the approximately transverse to the warp thread direction Weft thread lying between the cutting legs of the cutting device arrives. In this device, however, there is the disadvantage that after the cut, the remaining small weft ends next to the edge are pushed through the warp threads can because there is a risk that the small weft thread end in the cutting device gets caught, pulling it through the warp threads. This suffers the appearance of the bar. Another disadvantageous phenomenon is that the cutting device the weft loop did not reach, in case they did something for some reason is loosened, or not exactly in the direction of the cutting device going up and down because the tension in the chain is uneven.

The disadvantages mentioned are addressed by the subject matter of the present invention eliminated in which the cutting device is lifted between the warp threads and reaches its maximum position before the weft thread loop through the one gripper is entered. The cutting device consists of a housing in which the Cutting parts are guided. The housing is formed at the top to a point, which the warp threads cut up and towers over them in the uppermost position. When the weft loop is entered by the gripper, the weft thread to be cut is always lie in front of the tip and get safely into the recess of the housing. Since at the same time the cutting parts work when the housing is in the rest position, a reliable cut becomes achieved.

The present cutting device is also designed so that the weft thread is released immediately after the cut, in that the Cut parts go back to their rest position. Nevertheless, the case remains in its uppermost position in a perfect position of rest.

Furthermore, the invention consists in that in addition to the actual Cutting parts still parts for holding the weft thread during the cut in the Housing are arranged. These parts hold the weft during the cut firmly on both sides, creating a particularly increased security for the error-free Operation of the cutting device is guaranteed.

The invention is described below: Fig. R is a side view the cutting device in their rest position in the compartment shortly before the cut.

Fig. 2 is a front view of the cutting device at the same time.

Fig.3 is a side view of the cutting device after the cut has been made.

Fig.4 is a front view of the cutting device at the same time.

Figure 5 is a front view of another embodiment of the cutting device. Fig. 6 is a side view of this embodiment.

Fig.7 is side view of the cutting device with curve in the same Position as shown in Fig. I.

Figs. 8, 9 and 10 show a further embodiment of the cutting device without a device to hold on to both sides.

The cutting device consists of the housing i, which is in a point 2 passes, and below the tip 2 has a recess 3. The case i sits movably on the shaft .I and is controlled by the compression spring 5, which is on the adjusting ring 6 rests, pushed up. The housing is given by the elongated hole 7 and the bolt 8 i guidance in the shaft and the limitation of its movement.

The steel plate, which acts as a cutting tool, is located in the housing i 9, which is firmly connected to the shaft 4. On both sides of the steel plate 9 are the steel plates io and io ', which are held by the spring i i are and through the slots 12 and 12 'received so that they have a limited Move up and down.

If the cutting device is to come into effect, the shaft 4 by the action of an eccentric 13 or the like. With the mediation of the lever 1q., The Roller 15 and the joint piece 16 pushed upwards, whereby the whole cutting device from the starting position (Fig.2) is moved and the tip 2 of the housing the Chain threads 17 divided.

When the housing i goes up, the weft thread 18 is inserted and lies in the recess 3. At the point in time when the cut is to be made, the housing i is at rest, since it is already when the weft thread is inserted in the recess 3 has almost or completely reached its uppermost position by the stop i9 against which the reinforcement 2o of the shaft q. bumps, given is (Figs. 1, 2 and 7). If the shaft d. lifted up by the cam 13, so that which is designed as a cutting tool and is firmly connected to the shaft 4 moves Steel plate 9 in the same way upwards. With him, the two become the steel plate 9 slightly protruding steel plates io and io 'by the action of the spring i i likewise moved upwards, as far as the elongated holes 12 and 12 'allow. In the end press the two steel plates io and io 'against the weft thread 18 in order to clamp it, whereupon shortly thereafter the steel plate 9 as the shaft 4 continues to rise. the weft thread 18 cuts. Then the shaft q. pulled downwards. The cutting tip 9 and the plate io and io 'go through relaxation of the Spring 5, as far as the plates io and io 'come into question, also by relaxation the spring i i, again in its rest position, whereupon the further draft of the shaft 4. the entire cutting device is withdrawn to its starting position.

Figs. 5 and 6 show an embodiment in which two cutting tips 21 and 22, which are attached to the extension of the shaft 4, used for the cut will. The mode of operation of this form of training is exactly the same as that of the The device described at the beginning, only here is used for certain soft and fine Webbing ensures more reliable cutting because the cutting tips 2i and 22 engage in the recesses 23 and 2 ¢ of the tip 2 of the housing, whereby, since the web 25 of the tip: 2 engages between the cutting tips 21 and 22, the intervening weft thread 18 must necessarily break.

In this form of training, the attachment is as described above Retaining plates io and io 'not required, but they can of course can also be used to increase the cut resistance. Of course the cutting device can also be designed so that when in use only of a single cutting tip, the lateral retaining plates 1o and i o 'are omitted come, which is feasible with hard weft yarns (linen and the like).

As is readily apparent, the cutting tips 9, 21 and 22 also work in the horizontal direction with the appropriate design.

Claims (3)

PATENT CLAIMS: i. Weft cutting device for rapier looms, characterized in that the same is lifted between the warp threads and theirs The maximum position is almost or completely reached before the weft thread loop through the gripper is inserted into the recess (3) of the cutting device, and that the housing surrounding the cutting means during the cutting of the weft thread by the cutting parts guided in the same is in the rest position. 2. Device according to claim i, characterized in that the cutting parts only after reaching the highest position of the entire cutting device come into effect and immediately go back to their starting position after cutting through the weft thread, so that the cut weft is released before the entire cutter returns to its original position. 3. Device according to claim i, characterized in that that before and during the cutting the weft thread through a arranged in the housing, under spring pressure clamping device (platelets to and to ') is held. q .. Device according to claim i, characterized in that the tip of the housing is beveled and below the bevel has a recess (3) into which the weft thread is inserted to cut through.