DE1149128B - Thread changing device for circular knitting machines - Google Patents

Description

The invention relates to a thread changing device for circular knitting machines with relative to each other revolving systems that have a thread clamp arranged outside the needle circle and outside the Has needle circle arranged thread guide.

To change the thread during the knitting process, there are already numerous thread changing devices and ringing apparatus are known. These work almost exclusively in such a way that the thread that is inserted is to be clamped at its end and placed across the row of needles by the thread guide so that the needles passing by can grasp and kulate the thread. For single-cylinder circular knitting machines Therefore the thread clamp is mostly within the needle circle and the thread guide eye of the The thread guide is arranged in the working position outside the needle circle. For double cylinder circular knitting machines and in circular knitting machines with systems rotating relative to one another, as they are, for. Am the German patent 1114271 is a thread clamping within the needle circle not possible and as a result an exact insertion of the thread by the thread guide Difficulties associated. While in double-cylinder circular knitting machines the upper cylinder makes the area within the needle circle inaccessible for thread jamming, are in circular knitting machines with systems rotating relative to one another, the threads to the individual systems that Perform relative movements to each other, so keep separate that when moving the individual Systems during the circulation no crossing of the threads can occur. While for example the thread of the revolving system within the needle circle in a known manner by means of one on the Dial arranged clamping device clamped and by a corresponding vertical or horizontal movement of the thread guide can also be laid out and inserted, the threads of the stationary work system clamped outside of the needle circle and held to outside of the Area of the thread guide and thread of the revolving system to remain.

It has already been proposed for automatic double-cylinder stocking, when changing a thread Upper cylinder arranged and controlled by the switching drum from catch hooks briefly between slide out the needles so that the needles catch the newly inserted thread securely. This facility however, it cannot be used in circular knitting machines with systems rotating relative to one another.

Thread changing device
for circular knitting machines

Applicant:

Schubert & Salzer machine factory

Corporation,

Ingolstadt

Ewald Hänel, Ingolstadt,

Rudolf Mayer, Mailing at Ingolstadt,

and Hans Biswanger, Haunwöhr near Ingolstadt,

have been named as inventors

Another suggestion sees one above the needle circle arranged thread gripper, which is pivoted from the outside into the inside of the needle circle, to put the thread on the needles. However, this mode of operation is used in circular knitting machines where the systems perform relative movements to one another, not possible, as there is an assigned thread guide for each thread guide Gripper with control would be required, making the construction relatively expensive and gets complicated. In addition, the gripper can only return to its starting position after the thread has been inserted return when all needles driven out to take up the new thread are on this hook have run past, whereby the arranged above the needle circle and from the outside into the needle circle protruding gripper at the rotating thread guide and other parts belonging to the circulation system would hinder their work movement. In addition, a clamping and cutting device for Proposed reinforcement threads, the reinforcement thread guide within the needle circle through assign a control device pivotable holder. Since, however, the thread clamp for clamping of the reinforcement thread also inside the needle

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circle is arranged, this device is also not for the reasons already mentioned above Circular knitting machines with systems that are movable relative to one another can be used.

The present invention enables an automatic Thread change · during the knitting process in circular knitting machines with relative to each other movable systems, in that the thread guides each assigned within the needle circle, elastic pivotally mounted holders are arranged and by the thread guide for inserting a thread in a horizontal and vertical movement across the needle circle put the associated holder around to form a loop across the needle circle, which grab the needles for knitting and then pull them off the yielding holder. On the thread guide holder a pivoted tongue is attached, which is used to guide the thread guide in his horizontal and vertical movement cooperates with a guide pin attached to the thread guide and is pressed by a spring in the one pivoting direction against a stop.

Further details of the invention are explained with reference to the drawings.

1 to 4 show the thread changing process in individual working positions;

5 to 7 show an exemplary embodiment of the thread guide holder and the thread guide as well its movement in the side view.

In Fig. 1, the cover plate of the dial is shown in detail with the thread feed point on a circular knitting machine, omitting all parts not related to the thread change. The thread guide I is in the working position and lets the thread F _{1 run} over the thread bridge 1 to the needles N rotating with the cylinder Z. The needles are brought into the containment position at point 5 to open the tongues. Along the thread bridge 1, they are withdrawn into the catching position and take hold of the thread F ₁ that has been placed in front of them in order to knock them off at point 6 and knock off the old stitch. The thread guides II and III are in the rest position and the threads F _n and F _{111 are held in place} with the clamp 7.

In FIG. 2, the thread guide II begins the thread change by reaching over the needles and placing the thread F] ₁ behind the associated holder 2. The movement of the thread guide can be seen in FIGS. 5 to 7, which are described below. In its outermost display, the thread guide II lowers and is withdrawn again into its working position outside the needle circle and the thread bridge 1. The thread F _n now runs, as can be seen in FIG Needle circle away and around behind holder 2 again over the needle circle towards thread guide II. As long as the needles run past the thread bridge 1 in the catching position, they cannot grasp the thread lying above the thread bridge 1 and the cover disc 4. As soon as the thread guide II no longer grips over the needle circle, some needles remain in the containment position 5 and take with them the thread extending from the holder 2 to the thread guide II. As a result of the tension on the thread loop, it slides off the elastically pivotable holder 2 and is calculated at the point 6. Since the thread is now withdrawn from the thread supply through the thread guide, the thread end carried along by the needles is pulled out of the clamp 7 or separated by means of the thread cutter 9.

Following this insertion process, the thread guide I returns to the rest position (FIG. 4). As a result, the thread F _{1 runs} at a steeper angle to the culvert point 6 and over an indentation 11 on the suture bridge 1. The opened clamp 7 can now grasp the thread F ₁ lying above the indentation 11 with its tip 71 and clamp it to the clamping plate 72. As a result, the thread F _x is pulled so far to the left in the direction of rotation of the cylinder Z on the thread bridge 1 that it touches an electrically heated thread separator 9 protruding into the recess 12 of the thread bridge 1 and is melted. The free ends of the threads F are sucked off through the suction tube 8 when the clamp 7 is both open and closed.

The embodiment of the holder 2 shown in FIGS. 1 to 4 shows three perpendicularly on a shaft 22 vertically arranged holding sticks. By the leaf spring 3, which is attached to one of the holder shaft 22 Pressing flaps 21, the holding rods can pull the thread loop through an elastic Give in to pivoting movement and throw it off. Of course, the holder can also be used in other Kind and a torsion spring can be used instead of the leaf spring.

The movement of the thread guide II is shown in FIGS. 5 to 7 using an exemplary embodiment. This slides with a pin d along a tongue b which is arranged pivotably about the bolt c on the thread guide holder α . The spring / presses the thread guide II with the pen d against the tongue b . During the horizontal displacement of the thread guide along the pin h in the guide slot g , the front part of the thread guide is simultaneously raised by the tongue b (FIG. 6). The thread F _n is guided over the holder 2. At the end of the tongue & under the pressure of the spring / the thread guide snaps back into its horizontal position. The thread F ₁₁ has now been placed behind the holder 2. When the thread guide II is withdrawn, the pin d pushes the tongue b upwards, which is elastically pivotable by a spring e (FIG. 7).

Claims (3)

PATENT CLAIMS: 1. Thread changing device for circular knitting machines with systems rotating relative to one another, which has a thread clamp arranged outside the needle circle and a thread guide arranged outside the needle circle, characterized in that within the needle circle the thread guides (I, II, III) each associated, elastically pivotable holder ( 2) are arranged and that the thread guides for the insertion of a thread (F _n ) in a horizontal and vertical, over the needle circle reaching movement their thread around the associated holder, so as to form a loop placed across the needle circle, which the needles grab to knit and then peel off the yielding retainer. 2. Device according to claim 1, characterized by a swivel on the thread guide holder (a) bar mounted tongue φ), which works together to guide the thread guide (II) in its horizontal and vertical movement with a guide pin attached to the thread guide. 3. Apparatus according to claim 2, characterized by a spring (e) which presses the tongue φ) in one pivoting direction. against a stop Considered publications: German Patent No. 509 832; U.S. Patent No. 1240 250. 1 sheet of drawings