DE1585356A1 - Device for the automatic cutting and holding of threads on flat knitting machines - Google Patents

Description

Device for the automatic cutting and holding of threads on plachulier knitting machines

The present invention relates to a device for automatically separating and holding no longer threads or thread ends participating in the knitting process in placulier knitting machines.

When producing pieces of goods on flat weft knitting machines it is necessary to cut off all threads that are no longer participating in the knitting process at the edge of the goods. Likewise, thread ends, which when starting up a thread guide between the clamping device and the item of goods are created. The separation of these when inserting and laying out the thread guide Thread ends created at the edge of the fabric were previously carried out by hand with scissors. Purpose of The invention is to carry out this process automatically by a suitable device.

There is already a mechanical thread clamping and cutting device became known for flat weft knitting machines, which is attached to the deck machine (DRP 718.815). Each additional burden of the same makes

Unieriujvi.l (Art.; § 1 Paragraph 2 No. 1 Clause 3 of the amendment of 4 September 1967)

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however, a further reduction in the working speed during the covering is necessary. In addition, the working position of this thread clamping and cutting device is fixed for all times and can no longer be changed. The apparatus may merely m> ch severing of the yarn to be folded into a rest position.

Devices are also already known in which the thread ends by means of electrically heated thread separating elements be separated. The burners are attached to both sides of the needle contour and separate the thread as soon as it is pulled against the filament of the burner by the pulled-off goods. As long as the goods "is knitted over the entire width of the needle contour", as is the case, for example, on the double edge of stockings all threads no longer participating in the knitting process through irenn devices attached directly next to the fontur so separated that only short thread ends remain on the #are. However, during the further knitting process the thread ends produced during the separation process are longer, as the reduction progresses, since the thread separation elements the threads always in the same place, d. i. next to the font, cut off. When cutting, for example of high heel reinforcement threads, the thread end remaining at the a'are consequently has a length that is through the distance from the edge of the needle contour to the first working needle is determined.

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In order to eliminate this disadvantage, it has been proposed (DBP 1.086.388) to accommodate several thread separating devices or thread guides on one door If the goods are knitted across the entire width of the font, such as with stockings on the double edge, two further separating elements are arranged next to the material web, but in front of the Madelfontur. After reducing the size of the goods when the heel reinforcement works, in order to avoid the formation of long thread ends, λ this further pair of burners is swiveled up and brought into working position, after eo has previously been arranged to match the corresponding width of the goods, e.g. to match the width of the stocking in the area of the high heel reinforcement. However, if the threads at the tip are _{also to be cut after the end of the 1} "production, further pairs of torches would have to be provided at these points, which would make the device considerably more complicated and expensive.

According to French patents 1.1 ^ 6.339 and Ϊ »239.558 the separating device consists e.g. of a or more heating elements, which act as thread deflection fingers are trained. These are from their rest position below swiveled up the web and towards the edge of the font shifted, whereby the see from the blown off piece to the thread guide extending thread in a perpendicular

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brought the Naael row standing position and then separated when the thread of the already anculated new piece of goods is already being held again. According to this known solution, they are designed as separating elements Deflection finger can be moved in the longitudinal direction of the machine, but cannot be adjusted to the respective width of the fabric. In addition, the separation takes place after dropping the finished item of goods, so that this does not have a fixed position would allow an exact severing of the threads at the edge of the goods.

The object of the invention is to avoid the disadvantages indicated. This is done according to the invention in that a single pair of dividing elements, which can be adjusted to the edge of the fabric during the work process, for the separation of all threads is used in the immediate vicinity of the two edges of the fabric, depending on the width of the fabric can be movable both in the longitudinal as well as in the transverse direction to the machine. The threads are advantageously on both sides of the needle contour by a swiveling device that temporarily clamps the thread to be separated Thread feeder moved in the direction of the separating element.

The invention is described in more detail with reference to the drawings.

Fig. 1 is a partial view of a font with the invention Device in perspective view;

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Fig. 2 is a side view of the apparatus of the present invention with the thread feeder in rest position;

Pig. 3 is a side view of the apparatus of the invention with the thread feeder in the clamping position;

Fig. 4 shows, for example, a different arrangement and guidance of the thread separating elements.

Fig. T shows a perspective view of a detail a fontur of a flat-knitting machine with the ik-delbarre 1 and the needles 2, the sinker head 3 and the sinkers 4 and the thread guides 5.

In front of the needle bar 1 there are separating elements 25, 25 'on two Rods 28 and. 29 and a shaft 20 are arranged. The holders 27 and 27 'of the separating elements 25, 25' are on the Shaft 20 is mounted pivotably and displaceably. The holder 27 of the separating element 25 is fastened on the pull rod 28 and displaceable with it while it slides on the pull rod 29. In contrast, the holder 27 * of the separating element is 25 'attached to the tie rod 29 and slides on the tie rod 28. The two tie rods 28 and 29 are with a corresponding device, not shown here, known per se, such as, for example, with a double-acting Spindle or two toothed racks connected to a gearwheel, which enable a counter-rotating movement of the traction

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rods and thus the Irennelemente 25 and 25 'causes. In this way it is possible to adjust the distance between the two separating elements to the width of the goods S during the work process. A lever 30 is also attached to the shaft, which at the same time is connected to the tie rods 28 and 29, but without interfering with their longitudinal movement. This lever 30 is used to pivot the separating elements 25, 25 ' n & mX, the pull rod 28 and 29 around the shaft 20 via a linkage 51 from an eccentric (not shown).

On both sides of the sinker head 3 are known per se Clamping devices arranged, for example suction tubes 7, which the sins of the threads F of the not Hold the thread guides 5 participating in the knitting process or the severed thread ends of those participating in the ArbeitssprozesG Suck off the threads F.

A well-known person works with each suction tube 7 Thread feeder 10, 10 '(DRP Ö54.OO3) together:., To we Lc hem In addition, a thread clamp with a clamp tube! 5 or 15 'can be attached. iJese thread feeder IU and 10 · are rotatably mounted on the y / elle 20 and are from a shaft 21 via a fork 22 'into which a Angle pin 19 engages, actuated.

The thread clamp on Fadenvorbringer 10th consists .- ma <INEM clamping rolls 15 (Fig. 2), at a daa Ht at 12 befeuti ^ t

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is. This lever 12 can be pivoted with a bolt 13 attached to the support plate 11 of the thread feeder 10 and is by a spring 14 against a second, likewise printed on the support plate 11 with a bolt 17 pivotally attached lever 16, whereby the clamping roller 15 is held out of the clamping position.

The functioning of the separating elements is as follows:

At the beginning of a new stocking, the separating elements etehen 25, 25 * in the outermost edge position shown in Fig. 1, to separate the thread end of the inserted thread after the first rows on the edge of the goods, which is from the edge of the goods extends into the intake manifold mouth. During the In order to produce the double edge, the separating elements 25, 25 * are in their rest position, i.e. the two separating elements are pivoted back on the edge of the needle contour immediately next to the suction tube 7, so that the double edge rake can carry out the trigger and the transfer without hindrance. This position is shown in Fig. 2 with a dashed line Lines indicated.

To cut the threads after the trailing edge, the separating elements 25, 25 * are pivoted forward into the working position and adjusted to the corresponding fabric width. The separating elements remain in this standby position until the threads to be separated continue

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stepping goods take-off have been sucked against the separating elements and separated.

In order to obtain a sufficiently long thread end for the pneumatic holding and suction of the threads, it is advisable to use When laying out a thread, the thread take-up device 10, 10 'is actuated, which turns the thread into a long loop take off before it is separated from the separating elements 25, 25 '. This is not the case when inserting a thread necessary"

During the production of the elongation, the separating elements 25, 25 'go back to their rest position in order to possibly the need to lay out the needle bar 1 etc. not in the way to be.

Only for the separation of the high heel threads are the separating elements 25, 25 'pivoted out of their rest position and adjusted to the width of the goods by means of the tie rods 28, 29 in order to return to activity.

The separation process is the same as described above. However, you want the thread end to be as short as possible can be achieved when severing, the thread to be severed must be stretched so that it does not touch the edge of the fabric is rolled up. When severing by hand, this is usually carried out in a corresponding manner by the knitter himself

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while using mechanical clamping devices to hold the threads the tension generated by the thread lifter -. 'usreient. Will the threads As in the version shown in the drawings, held and suctioned by means of air tubes is sufficient Do not use this pull-off force to tension the thread in order to prevent the thread from curling into the edge of the fabric.

For this purpose, an additional clamp with clamping tubes 15 or 15 * is attached to each of the yarn take-ups 10, 1ü ^f. As soon as the thread, which extends from the are to the withdrawal tube 7 or the laid-out thread guide, has been taken along a piece with the goods so that it is at a sufficiently large distance from the needle contour, they can be rotated on the shaft 20 seated thread feeder 10 actuated. For this purpose, the shaft is given a short rotation, which is transmitted via the forks 22 and the angle pin 19 to the thread feeder 10 and pivots it forward. This is done by the thread feeder. 10, the thread F extending between the edge of the fabric and the thread guide 5 is grasped, brought forward, pulled out of the thread guide in a loop and clamped by the clamping roller 15 in the knee 101 of the thread feeder 10 by pushing the adjusting screw 18 against the stop 23, as shown in FIG.

After the thread F has been clamped between the knee 101 of the thread feeder 10 and the clamping roller 15

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before the thread is cut, the fabric S is another Peeled off, so that the one held by the spring clip thread F to be separated is taut. Because of that ο tensioning of the thread is achieved that the .Varenkante rolls up, whereby the thread is severed close to the edge of the fabric can be.

The heating of the separating elements 25, 25 'only takes place in the ready position. After the thread has been separated by the separating elements at the edge of the fabric, the thread feeder 10 is swiveled back into its starting division ψ , whereby the thread clamp with the clamping roller 15 opens. The severed thread end is caught by the suction of the suction tube 7 and sucked into it, with a sufficiently long thread end being pulled out of the thread guide 5 by pivoting the thread feeder 10, which can be held by the suction tube 7 with certainty. The same process is repeated in a similar way when separating cer threads at the beginning of the tip and after finishing the stocking, the two separating elements 25, ^ 5 'up

approach to a small gap.

Fig. 4 shows a further embodiment of the thread separating device according to the invention. The separating element 25 is slidably mounted on a tube 41. The tube 41 has a slot 43t i * ^{1 on its upper side}

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the holder 40 engages. The rubbing into the slot 43 Part of the holder 40 is attached to a Bowden cable 42 guided in the tube, with which the separating element is moved.

To the separating elements 25 ; 25 'to bring the slotted tube 41 is bent on the sides of the pontoon (41 ¹ ), so that the separating element 25 or 25 * can be moved to the vicinity of the suction tube 7.

The movement of the separating elements can be modified in various ways. For example, the Separating elements 25 and 25 'transversely to the longitudinal machine direction be moved and pivoted in the longitudinal direction of the machine. It is also possible to use the dividers in both To pivot directions, or to move only in the direction of the longitudinal axis of the machine.

with the latter, however, the separating elements have to go that far lii.oh can be brought outside that they move üfea Doppelrandr.jchens are not in the way.

Ivüit. The device according to the invention will help all Thread and thread ends at the edge of the goods are automatically cut and removed without any manual operation.

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Claims (4)

Claims Ίο Device for automatic disconnection and holding of threads on flat knitting machines, characterized by a single, on the edge of the fabric during the Work process adjustable pair of separating elements (25, 25 ') for the separation of all threads in the immediate Proximity of the two edges of the goods, 2. Apparatus according to claim 1, characterized in that the separating elements (25, 25 ') of each pair of separating elements depending on the respective fabric width in the longitudinal direction of the machine opposite are arranged movable to one another. 3. Device according to claims 1 and 2, characterized in that that the separating elements (25, 25 ') depending on the respective width of the goods in the longitudinal direction are arranged to be displaceable to the machine and pivotable in the transverse direction. 4. Device according to claims 1 and 2, characterized in that that the separating elements (25, 25 ') as a function arranged to be movable lengthways and crossways to the machine * depending on the width of the goods 909838/0720. BATH ORIGINAL 1585358 5β device according to claims 1 and 2, characterized in that that the separation elements (25, 25 ') depending on the respective width of the goods in longitudinal and arranged to be pivotable in the transverse direction to the machine are. Device according to claims 1 to 5, characterized by one arranged on both sides of the needle contour, The pivotable pair of thread feeders (10, 10 ') temporarily clamping the thread to be separated. 909838/0 7 20