US2086933A - Circular warp knitting machine - Google Patents

Description

Patented July 13, 1937 UNITED STATES PATENT OFFICE CIRCULAR WARP KNITTING MACHINE Application March 26, 1934, Serial No. 717,510 In Germany April 7, 1933 3 Claims.

but out of phase with each other'or one aiter the other, and since the fabric .wilkthenlbe either urged by the two groups in opposite iiirections or held down by one group while the other operates, the need for presser rings which cause a great deal of vibration and noise, or for web-holders which complicate the machine con- 20 struction, will be eliminated. Besides, since only half the number of needles are engaged in loop making at any particular time, the supervision of the machine will be easy, and since the spacing of the threads will be correspondingly doubled, entanglement of threads and the trouble and waste of time accompanying such entanglement will be avoided.

Fig. 1 of the accompanying drawing represents a fragmentary sectional view of a knitting machine constructed according to the invention,

Fig. 2 is an elevation at right angles to Fig. 1,

Figs. 36 are diagrams illustrating the needle positions at difierent stages of the knitting operation,

Fig. 7 is a fragmentary sectional view of a machine of modified construction, and

Figs. 8-11 are diagrams illustrating the needle movements obtainable with the modified machine construction.

In the illustrated arrangements, the machine comprises a needle cylinder 9 having vertical tricks in which the knitting needles are slidably mounted in the usual manner. In Figs. 1 and 2 the needles are controlled and operated by rocking levers Ill and II which are fulcrumed on pivots I! carried by bearing brackets IS, the latter being mounted on a support H secured to the needle cylinder 9. There is one rockinglever for each needle, and the butts of the needles engage in forks at the ends of the levers so that the rocking movement of the levers will result in an up and down movement of the needles. Levers l alternate with levers II, the former being double-armed and the latter singlearmed. A vertically reciprocated operating ring I8 is provided with arms i3 and I secured tothe ring by means of leads M. The arms 13 engage the levers I0 pivotally at one side of the fulcrum l2, and the arms l5 engage the levers l I in the same way but at the opposite side of the fulcrum. The result of this arrangement is that one group of alternately arranged needles will be moved upwards while the other group is moved downwards by the operating ring l8.

Figs. 3-6 illustrate the needle movements rela- .tive to the cylinder trick wall 25 of the machine. Six consecutively numbered needles are shown in these figures, (eight needles in Fig. 2), the needles with odd numbers being operated by the levers H and those with even numbers, by the levers Ill. In Fig. 3 the needles with odd numbers are descending and the needles with even numbers are being raised by the downwardly moving operating ring i8. At a further stage of the movement, all the needles will be on a level with one another, as shown in Fig. 4. At

a still further stage, the needles with even numbers will be on a higher level than those with odd numbers, as shown in Fig. 5. When the operating ring i8 reaches its lowermost position, the needles will occupy the position shown in Fig. 6 which is reversed from that of Figs. 1

, and 2. Thereupon the operating ring begins to move upwards, and while loops are being formed bythe needles with even numbers, those with odd numbers are raised to the initial position shown in Fig. 2.

Since one group' of needles moves upwards while the other moves downwards, the tendency of the fabric to follow the needles will have no effect, and the usual drawing-off mechanism will be sufficient to keep the fabric in position.

In the arrangement shown in Fig. '7 there are two independently moving operating rings 21 and 24, one for each group of needles. The butts of the latter engage in forks l9 and 22 connected respectively to leads 20 and 23 on the two rings,

the lever action previously described being thus' dispensed with. While the movement of the operating rings 2|] and 24 can be controlledso as .to produce the same action as that described in connection with Figs. 1 and 2, the action can i be varied according to requirements, for instance so that one group of needles remains stationary while the other is operated. v

Figs. 8-11 illustrate such anaction. In Fig. 8 the needles With odd numbers are about to descend and will do so while the needles with even numbers remain stationary in their lowermost positions. When both sets of needles are level as shown in Fig. 9, the needles with even numbers will be raised, as shown in Fig. 10, while the needles with odd numbers remain stationary, and when the needles with even num bers again arrive in the lowermost position, as shown in Fig. 11, the cycle of operations is repeated.

In the illustrated arrangements vertically operating latch needles are employed, but bearded needles can be operated in the same manner. The arrangement is also suitable for horizontally operating needles as well as for machines wherein both vertically and horizontally operating needles are employed at the same time.

I claim:

1. In a circular warp knitting machine, the combination with a needle cylinder and with needles arranged in tricks in said cylinder, of a rocking lever operatively engaging each needle, a support whereon each lever is fulcrumed, an operating ring, and arms on said ring pivotally connected to the different levers for rocking the latter, adjacent levers having their pivotal connection with the arms situated at opposite sides of the support so as to be rocked in opposite directions.

2. In a circular warp knitting machine, the combination with a needle cylinder and with needles arranged in tricks in said cylinder, of two independently movable operating rings for said needles, adjacent needles being connected to different rings.

3. A circular warp knitting machine comprising a needle cylinder, needles carried thereby, the needles being divided into two groups, the needles of one group being intercalated with the needles of the other group, all of said needles being operated simultaneously, but the needles of one group being operated out of phase with the needles of the other group.

MAX RICHARD BoHMER.

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