Latch needle for machines for producing knitted goods

Details Latch needle for machines for producing knitted goods Latch needle for machines for producing knitted goods

1983-05-16

1985-02-12

Feldbaum, Ronald

Textiles: knitting

Needles

Pivoted latch

D04B 3504

Patent

active

044983158

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a latch needle for machines for producing knitted goods. The needle has a needle shank, a needle head and a latch which is pivotably supported in a latch slot.
One of the important preconditions for the satisfactory functioning of a latch needle, for instance in a knitting machine, is that the needle open and close perfectly during the knitting operation. The latch is therefore guided relatively precisely in the latch slot and is oriented with its latch spoon pointing to the tip of the hook.
In practice, however, it has been demonstrated that, particularly after being in use for a relatively long time, the latch undergoes a lateral deflection as it closes during the knitting operation, to such an extent that the latch is then beside or beneath the head of the needle. The result is that the latch is no longer capable of opening, which makes the latch needle unusable, and a flaw is created in the goods.
This undesired lateral deflection of the latch during the closing movement, which prevents the latch from coming properly to rest against the needle head, has been found to have two particular causes, which interact with one another but of themselves are entirely distinct:
In order to assure easy pivoting of the latch, the latch must have a certain amount of play both axially and radially, despite the precise embodiment of its support. A certain mobility on the part of the latch toward either side of its pivoting plane is therefore unavoidable; that is, the latch is capable of swinging or rolling somewhat to the side. Because of the length of the latch, this lateral mobility of the latch which in itself is only slight makes possible substantial lateral deflections of the free end of the latch spoon, even if only slight lateral forces are being exerted on the latch.
In a high-speed, highly systematized circular knitting machine, with a correspondingly high speed at the circumference of the needle cylinder and the dial, substantial Coriolis forces already occur during the closing and opening movements of the latch, which take place at a high rotational speed; during the closing movement of the latch, these Coriolis forces stress the latch laterally and press it against the wall of the latch slot located toward the rear, in the rotational direction of the machine. As a result, not only is the latch subjected to a lateral stress, but the rear wall of the latch slot in the direction of rotation is also subjected to increased wear. As a result of the pivoting movement of the latch, which in a conventional automatic stocking-knitting machine for producing seamless stockings opens and closes over 40 times per second, for instance, the latch and the wall of the latch slot wear each other down, which necessarily causes an increase in the lateral play of the latch guided in the latch slot. Now when the unavoidable increase in latch support play that occurs over long needle use is added, then the lateral deflection of the free end of the latch spoon can become so great, as already explained, that when the latch closes its latch spoon will miss the needle head, or will slide off to the side thereon, thus coming to rest underneath or beside the needle head and causing the latch needle to become unusable.
It is the object of the invention to overcome this problem and to create a latch needle with which it is assured that, even after a long period of use, the needle latch will close perfectly and will not come to rest beside or beneath the needle head when it closes.
In order to attain this object, the latch needle described at the outset above is characterized in accordance with the invention in that the latch spoon is tilted with respect to the plane of symmetry of the latch and points toward one end of the needle shank, and that the lateral distance between the most extreme point of the latch spoon and the plane of symmetry of the needle is at most equal to half the shank thickness.
The tilting of the latch spoon, which is adapted to the associated contact surfaces of the latch spoon and the needl

REFERENCES:
patent: 956318 (1910-04-01), Egly

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