DD284925A5 - LATCH NEEDLE - Google Patents

Abstract

The invention relates to a latch needle, which is used in knitting and knitting machines. Geloest the task is that dasz the tongue shaft on the inside, starting from the hole for the pivot axis to the tongue, not as usual with reducing tongue shaft width, but formed in a similar width and the wider tongue shaft towards the tongue with a screw to Holding the basic thread runs out. Fig. 1 {latch needle; Knitting and knitting machine; Plate; Ground thread; plaiting; Latch shank; Pivot axis; Zungenloeffel; Needle latch; Knitting quality}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a latch needle, which is used in knitting and knitting machines.

Characteristic of the known state of the art

In the manufacture of knits and knitting is often the application of plating, with two different threads are fed separately to the needles so that they maintain their position during the stitching their relationship to each other and thus a thread as a basic thread on the left side of the fabric and the other thread Plating thread is visible on the right side of the fabric.

In order to implement this basic rule, various technical means have hitherto been used in practice in order to make plating safer for production.

From the prior art it is known that the thread guide is designed so that the plating thread and the main thread are guided by two different openings of the thread guide so that differentiated entry angle arise and thus the two threads side by side or one above the other in the open needle hook between the needle head and Needle breast are inserted.

The thread tension for both threads must be adjusted correctly. Each thread is guided through its own thread tensioner. The tension of the basic thread is held a little firmer, so that it is firmly in the needle head and can not push in front of the Plattierfaden because of the greater friction.

However, practice shows that the hitherto known technical means are not sufficient to ensure the required production reliability for a flawless plating.

Plating errors occur, for example, in hosiery, which are produced on double-cylinder knitting machines in right-right binding or as ribbed goods. Because of this alternating stitch formation by needles in the upper and in the lower needle cylinder, the two threads are supplied side by side to the needles by means of special thread guides.

In this yarn feeding, thread tension variations from bobbin to bobbin or within a bobbin, as well as differences in the yarns between different spinning batches, colors or color batches, already lead to frequent plating defects.

Another major disadvantage of this yarn feed on double cylinder machines arises when working the pendulum and pendulum tip, with the change of the direction of rotation of the needle cylinder and especially at high speeds, the position of the two separately incoming threads does not remain constant and the known Plattierfehler arise. In addition, it is known that to improve the leadership of both threads between the needle breast and needle hook is trying to assist with special movements of boards or Hilfspiatinen the location of the two threads until the beginning of the stitch formation.

However, this support by boards is not effective when z. B. for tights a large difference in the required mesh size between upper leg and shackle is present, whereby the changed position of the needle to the board ensures no safe and constant guidance of the two threads.

The tongue needles known from the prior art have a reducing tongue shaft width.

By this hitherto customary design of the needle tongue often occur plating errors in thread supply differences, because the background thread can slide under the Plattierfaden.

Object of the invention

The object of the invention is to provide a latch needle to reduce the number of plating errors, thereby improving knitting quality and increasing productivity.

Explanation of the essence of the invention

The invention has for its object to make a latch needle so that during the knitting process, the background thread is not pushed under the plating thread.

According to the invention, the object is achieved in that the tongue shaft on the inside, starting from the bore for the pivot axis to before the tongue spoon, not as usual with reducing tongue shaft width, but in a similar width and the broad tongue shaft towards the tongue spoon with a Sloping to hold the ground thread runs without the basic function of the needle tongue in the stitch formation is adversely affected.

When closing the tongue of the basic thread is held by the nose-shaped projection on the tongue shaft in its defined position and thus prevents that in this needle position, the background thread can slide under the Plattierfaden.

The bevel from the widened tongue shaft to the tongue spoon ensures a good sliding transition of the half-stitch over the open tongue. The slope on the tongue is advantageously chosen so that the angle between the slope and the tongue central axis is in the range of 45 ° to solve the problem.

Essentially, the advantages of this latch needle are that the number of plating errors is reduced to improve knitting quality and increase productivity.

embodiment

The invention will be explained in more detail with reference to an embodiment. In the accompanying drawing show

Fig. 1: a side view of the head and chest area with the inventively designed needle tongue with open needle head and completely covered tongue

Fig. 2: a side view of the head and chest area with the inventively designed needle tongue in the closed position on the needle head.

Fig. 1: Part of the needle 1 with the chest area 2, the needle head 3 and the inventively designed needle tongue 4 can be seen.

The needle tongue 4 is pivotally supported by the pivot axis 5 for opening and closing movement. The broadening of the tongue shaft according to the invention in the similar width of the tongue shaft in the region of the pivot axis 5 extends over a length A advantageously half the length of the tongue from the pivot axis 5 to the end of the tongue spoon 6. The widening extends to the point B and goes from because of with a slope C at an angle aiming area by 45 ° to the imaginary tongue central axis 7 to the previously usual pronounced spoon 6 via.

Fig. 2: shows a part of the needle 1 with the inventively designed needle tongue 4 in the closed position, wherein the spoon 6 covers the tip of the needle head 3.

In the tongue movement to this closed position and the further movement of the needle, the base thread 8 is held by the inventive broadening of the tongue shaft with the slope C in the required defined position and thus avoided that the main thread 8 can slide under the plating thread 9.

Claims (4)

1. latch needle for knitting and knitting machines, with a needle shaft and a pivotally mounted in the chest of the needle tongue, characterized in that this needle (1) a broadening of the tongue shaft in a similar width of the tongue shaft in the region of the pivot axis (5) via a certain length (A), calculated from the pivot axis (5) to the point (B), wherein the broadening from point (B) at a certain angle (α) decreases until the start of the conventionally shaped spoon (6 ). 2. latch needle according to claim 1, characterized in that the broadening of the tongue shaft has a certain length (A), which is preferably half the distance from the pivot axis (5) to the end of the spoon (6). 3. latch needle according to claim 1, characterized in that from the point (B) to the beginning of the pronounced in conventional form spoon (6) sloping slope (C) has a certain angle (α), which is preferably 45 °. 4. latch needle according to claim 1, characterized in that by means of the slope (C) of the widened tongue shaft of the ground thread is durable so as not to be pushed under the Plattierfaden.