US2427394A

US2427394A - Warp knitting machine

Info

Publication number: US2427394A
Application number: US692220A
Authority: US
Inventors: Richard F Eshleman
Original assignee: American Viscose Corp
Current assignee: Akzo Nobel UK PLC
Priority date: 1946-08-22
Filing date: 1946-08-22
Publication date: 1947-09-16
Anticipated expiration: 1964-09-16

Description

Sept. 16, 1947. R. F. ESHLEMAN WARP KNITTING MACHINE Filed Aug. 22, 1946 INVENTOR.

RICHARD" F. ESHLEMA N 'hww Patented Sept. 1d, 1947 WARP KNITTING MIACHINE RichardE Eshleman, WestChester, Pa., assignor to American Viscose Corporation, Wilmington, DeL, acorporation of Delaware Application August 22, 1946, 'SerialN'o. 692,220

(cite-86) Claims.

The invention relates to a warp knitting machine comprising knitting elements including needles and the like, and a cam shaft carrying camswhich engage cam-followers for controlling the knitting cycl of the elements.

In this type of war-p knitting machine, it is virtually impossible to adjust the followers so that they engage-the cam surfaces without play. Generally, it is the practice to provide for each movement, that is, for example, for the movement of the knitting bar, a plurality of cams spaced along the cam shaft, a-plurality of countercams one adjacent each cam and followers for each cam and countercam set, each pair of followers being carried by a single lever mounted pivotally for transferring the motion to the particular bar carrying the knitting elements, such as the needle bar, guide bar, sinker bar, or presser bar. When it is desired to adjust the operation of the knitting elements, such as the operation of the needle bar, it is customary to effect the adjustment by moving the cam follower roller carried by the lever in, a slot therein closer or farther from the cam and then taking up the slack by moving the other follower roller against the countercam. The impossibility of maintaining a complete absence of play between the several cams and followers results in excessive wear and vibration, particularly when it is desired to operate the machine at high speed, since the levers are given an oscillator or rocking movement by-the cams and a'blow or shock is transmitted between them at every reversal of the direction of suchmovem'ent.

In accordance with the present invention, the wear and the vibration are reduced to .a negligible amount by supplying th peripheries of the cams with a film of viscous liquid, such as by allowing the cams to dip into, or run at least partially immersed in the body of the liquid.

This liquid should preferably be stable and noncorrosive, and have a viscosity of at least S. A. E. 10. The viscous film between the cam surface and the follower occupies any clearance or play and exerts a cushioning effect between the cam and follower surfaces thereby greatly reducing the vibration and wear.

The drawing is illustrative of preferred embodiments of the invention and Figure 1 is a rear elevation, with parts broken away, of a warp knitting machine embodying the invention,

Figure 2 is a transverse section illustrating diagrammatically the connections between the knitting elements and the cam shaft, and

Figure 3 is a transverse cross-section similar to Figure 2 of a modification.

As shown 'in Figures 1 and 2, the knitting machine comprises a needle bar 2 carrying needles 3, a sinker bar 4 carrying 'sinkers 5, a presser, bar 6, and two or more guide bars (not shown) carrying guides 1 and 8 (Figure 2). The needle bar and presser bar are pivotally mounted on shafts 9 and I0. The 'guidebars are similarly mounted but to clarify the illustration and, to make it as simple as possible, the mounting of the guide hers is not shown, since they are in all respects similar to the mountings of the needle bar "and presser bar. The needle bar, presser bar, etc, are rocked pivotally upon their shafts 9, 10', etc., by means of the levers "l I and !2 whose forked ends carry laterally offset roller followers l3. These rollerfollowers are carried on stud shafts l4 mounted in slots through the forked ends of the levers l I and I2 to permit adjustment by means of nuts [5 in conventional manner.

Aicamshaft I6 is mounted in suitable bearings in theupright framemembers I1 and carries a plurality of cams .118 and countercams l8 for engagement with'the roller followers carried by the i-forkedlevers "t2 and :a plurality of cams l9 and :19 :for engaging the followers l3 carried by.'forked:=levers ll. Additional cams which are not :-shown are providedfor controlling the guide barsiand'tension bars. So far, the machine clescribed zisconventional in' all respects.

Iniac'cor-dance with the present invention, a receptacle 20 is provided beneath the cam shaft. This receptacle is adapted to receive a viscous liquid ata sufficient level so that the cams are atleast partially immersed. The immersion may be sufficient to'cause the cams to run constantly through the liquid, or it may be somewhat less (asshown) toassure that the cams dip into the liquid .at least part of the cycle of revolution.

The receptacle 20 may be covered or open as shown. When open, means for deflecting any spray of the liquid out of the receptacle is provided above the cams when the machine is adapted to operate at high speeds to prevent soiling the materials being knitted. As shown in Figures 1 and 2, the deflecting means comprises transverse members 2| which extend across the receptacle and are secured thereto, one deflector over each cam. A modification is shown in Figure 3 in which a deflector member 22 is carried on each side of each of the forked levers H, l2, etc., so that such a deflector member is positioned above each cam.

These systems eliminate the necessity to provide a flexible seal between the cover of the receptacle and the oscillating forked levers.

As will be seen from the drawings, the cams dip into the viscous liquid and carry a film thereof into engagement with the roller followers, thereby eliminating to a large extent undesirable vibration and wear and allowing higher speeds to be attained.

Any suitable liquid having sufficient stability, viscosity and non-corrosiveness may be supplied to the container 20 which preferably is made of sufficient length to supply all of the cams between any two upright frame members I! of the machine, such as those at the ends of the machine. In case the machine has great length for producing broad fabrics, one or more upright frame members I! may be disposed between those at the ends of the machine, and a separate receptacle may be provided between each adjacent two of such upright members. If desired, however, the receptacle may extend through the frame members or communicate with the receptacle on the other side of such a frame member. Again,

each set of cams (that is, an associated cam and countercam) may be provided with a separate receptacle.

Numerous liquids of stable, viscous, non-corrosive character may be used in the machine, provided they have a viscosity of at least S. A. E. 10. Examples are the liquid silicones produced by the condensation of silica with alkylene halides. Hydrocarbons and their condensation products having the desired viscosity, stability and noncorrosiveness are also suitable. These hydrocarbons may include the parafiins, the naphthenes and the aromatics.

It is to be understood that changes and variations may be made without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. In a warp knitting machine, elements comprising needles, a cam shaft for controlling the knitting cycle of the elements, means for rotating the cam shaft, cams on the shaft, a receptacle under the cam shaft, means for applying a stable, viscous, non-corrosive liquid to the periphery of each of the cams, cam follower means engaging the cams through a viscous film of the liquid thus applied and an individual deflecting member extending across the receptacle above each cam for returning liquid sprayed from the cam to the receptacle.

2. In a warp knitting machine, elements comprising needles, a cam shaft for controlling the knitting cycle of the elements, means for rotating the cam shaft, a receptacle under the cam shaft for containing a stable, viscous, non-corrosive liquid, cams on the shaft dipping into the liquid, cam follower rollers engaging the cams through a 4 viscous film of the liquid lifted by the rotation of the cams to the position of engagement with the follower rollers, and an individual deflecting member extending across the receptacle above 5 each cam for returning liquid sprayed from the cam to the receptacle.

3. In a warp knitting machine, elements comprising needles, a cam shaft for controlling the knitting cycle of the elements, means for rotating the cam shaft, a receptacle under the cam shaft for containing a stable, viscous, non-corrosive liquid, cams on the shaft dipping into the liquid, cam follower means engaging the cams through a viscous film of the liquid lifted by the rotation of the cams to the position of engagement with the follower means, and deflecting means carried by the follower means above the cams for returning liquid sprayed from the cams to the receptacle.

4. In a Warp knitting machine, elements comprising needles, a cam shaft for controlling the knitting cycle of the elements, means for rotating the cam shaft, a receptacle under the cam shaft for containing a stable, viscous, non-corrosive liquid, cams on the shaft dipping into the liquid, cam follower means comprising forked levers carrying rollers engaging the cams through a viscous film of the liquid lifted by the rotation of the cams to the position of engagement with the rollers, and an individual deflecting member carried by the forked lever and extending transversely of the receptacle above each cam for returning liquid sprayed from the cam to the receptacle.

5. In a warp knitting machine, elements comprising needles, a cam shaft for controlling the knitting cycle of the elements, means for rotating the cam shaft, a receptacle under the cam shaft and extending at least the full length of the cam-carrying portion of said shaft for containing a stable, viscous, non-corrosive liquid, cams on the shaft dipping into the liquid, cam follower means comprising forked levers carrying rollers engaging the cams through a viscous film of the liquid lifted by the rotation of the cams to a position of engagement with the rollers, and an individua1 deflecting member carried by each forked lever and extending transversely of the receptacle above each cam for returning liquid sprayed from the cam to the receptacle.

RICHARD F. ESHLEMAN.

REFERENCES CITED FOREIGN PATENTS Country Date Germany Mar. 14, 1936 Number 627,392