US2667773A

US2667773A - Warp tensioning bar for knitting machines

Info

Publication number: US2667773A
Application number: US241833A
Authority: US
Inventors: Carlos A Hepp
Original assignee: Alfred Hofmann & Co
Current assignee: Alfred Hofmann & Co
Priority date: 1951-08-14
Filing date: 1951-08-14
Publication date: 1954-02-02
Anticipated expiration: 1971-02-02

Description

Feb. 2, 1954 c. A. HEPP WARP TENSION BAR FOR KNITTING MACHINES Filed Aug. 14, 1951 FIG.2

0x72277776 BY I Patented Feb. 2, 1 954 WARP TENSIONING BAR FOR KNITTING MACHINES Carlos A. Hepp, Englewood, N. 3., assignor to Alfred Hofmann & (10., West New York, N. J.,

a corporation Application August 14, 1951, Serial No. 241,833

'7 Claims. '1

This invention relates to tension bars for warp knitting machines.

In warp knitting machines known in the art, tension bars are provided which guide the yarns from the warp reels to the knitting elements of the machine, such bars including resilient means for tensioning the advancing yarns during the knitting cycle. Such tension bars have excessive up and down motion, particularly in ma- '2 ing portion it to limit the upward movement of the pin.

As shown in Fig. 2, the upper ends of pins 55 are interconnected by a longitudinally extending yarn guide bar It which is parallel to support H. The bar 18 may be of a light and somewhat flexible material such as metal or the like.

Means is provided for resilient movement of the guide bar 58 relative to the arm members chines operating at high speeds. Such excessive To this end, a coil compression spring it is motion adversely affects the quality of the knitted mounted on each pin 15, being located between fabric and also impairs the efficiency of operathe underside of the bar l8 and the upper end oi tion of braking and reel driving mechanisms bearing portion M, thus the guide which are commonly actuated by suitable conto an upper position.

nection to the tension bars. l5 arm members l2 may be resiii-ently sup- Accordingly, an object of this invention is to ported by spring means generally indicated at 28 provide improved yarn tension and guide means and more fully described in Patent 2,521,213. which has materially reduced motion during the The springs IQ yield more readily than spring several phases of the knitting cycle. means 26, thus allowing the guide bar It to have Another object of this invention is to provide 20 resilient movement relative to arm members 52. a device of the character described which in- It will be apparent, that with a sheet of yarns eludes improved means variably adjusting the y indicated by the dot and dash line, moving in operation of the yarn tension means along the the indicated path from the reels, not shown and several sections of the yarn tension bar. directed by the bar it, to the knitting elements,

Other objects will in part be obvious and in not shown, that any change in the tension of part hereinafter pointed out. the yarns will cause pins IE to move up or down The invention accordingly consists in the comthrough the action of the compression springs bination of elements and the arrangement of it. With an increase in yarn tension, the springs parts as exemplified in the embodiments hereinwill be compressed while a decrease in tension after shown and described. will cause the springs to expand, thus maintain- In the drawing: ing a. uniform tension on the moving yarns. It

Fig. 1 is a side elevational view of a warp tenis understood that springs 19 may be selected to sion bar embodying the invention; provide suitable tensioning values. The angular Fig. 2 is a top plan view thereof; and relation of bearing portion M to the arm mem- Fig. 3 is a side elevational View of a modified bers [2 may be suitably determined to provide form of the invention. proper flow of the yarns.

Referring in detail to the drawing and par- The resilient capacity of the individual springs ticularly to Fig. 1, I0 designates an improved I9 may be separately controlled, as shown in Fig. warp guide and tension bar for a warp knitting Here, the p 5 are of eXtended length 50 machine. The same comprises a support I! suitas to provide a portion 2! ext ndin below bearably mounted on the frame of the knitting maing portion It. The lower end of portion 2| is chine and may be arranged for rocking motion threaded to receive a nut 22 which bears against about the longitudinal axis thereof. Extending at a collar 23 on the pin portion. A second comright angles from said support, are a plurality of pression spring 26 is mounted on pin portion 2i similar, spaced arm members [2 which may be between the collar 23 and the lower end of bearformed of light metal in inverted channel form. ing D The inner end of each arm may be secured to the It will be apparent t the Spring action support by means of a screw [3. each pin a may be regulated by adjusting the The outer end of each arm member is formed nut 22, thus determining the initial compreswith an angularly related bearing portion [4 in 50 sion of p gs 19. Since the guide ba I3 is somewhich is slidably mounted a pin IE to provide for what flexible, variable tension responses may be movement thereof substantially transversely of P ded a ong the length th y individually the arm member. The pin I5 is provided with a adjusting the springs on the pins I511. Thus, the transverse projection I? at the lower end thereof quality of the knitted fabric may be accurately which is adapted to engage the lower end of bearcontrolled and the selvage ends of the machine may have differential tension for the yarns at the selvage portions of the knitted fabric.

In the event that the tension of the yarns moving over bar l8 exceeds the compression limits of springs l 9, then arms 12 will move downwardly against the action of spring means 20, to rock support I I. The support I l is adapted to be conneoted to suitable mechanism for braking or driving the reels, as more fully described in Patent 2,521,218.

It will be apparent that the excessive up and down movement of arm members [2 will be avoided, since the major portion of the yarn tensioning will be provided by the spring pressed pins !5 or I5a.

As various possible embodiments might be made of the above described invention, and as various changes might be made in the embodiments set forth, it is understood that all matter herein set forth or shown in the drawing, is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim as new and desire to protect by Letters Patent:

1. In a warp knitting machine, a support, an arm fixed to said support, a member mounted on said arm for slidable movement substantially transversely of said arm, a yarn tension bar mounted on said member and resilient means on said member for resiliently supporting said bar relative to said arm.

2. In a warp knitting machine, a support, an arm on said support, said arm including a bearing portion, a member slidably mounted in said bearing portion, a yarn tension bar mounted on said member and a compression spring on said member and located between said bar and said bearing portion.

3. In a warp knitting machine, a support, an arm extending from said support, a pin slidably mounted on said arm, yarn tension means mounted on said pin and spring means for resiliently controlling the movement of said pin.

4. In a warp knitting machine, a support, an

4 arm extending from said support, said arm including an angular bearing portion, a pin slidably mounted in said bearing portion, yarn tension means mounted on said pin and resilient means for urging said yarn tension means in a given direction.

5. In a warp knitting machine, a movable support resilient means for controlling the movement of said support, a yarn tension bar movably mounted on said support, second resilient means for controlling the movement of said tension bar relative to said support, said second resilient means having a greater yieldability than said first resilient means.

6. In a warp knitting machine, a support, an arm extending from said support and including a bearing portion, a pin slidably mounted in said bearing portion, yarn tension means including a bar mounted at one end of said pin, spring means on said pin for urging said bar in a given direction and second spring means on said pin for controlling the operation of said first mentioned spring means.

'7. In a warp knitting machine, a flexible yarn guide bar, a support, a plurality of spaced members for mounting said bar on said support, the outer end of each member including a bearing portion, a pin slidably mounted in each bearing portion, one end of each pin engaging said bar, resilient means on each pin for urging said bar in a given direction and means for independently adjusting the action of each resilient means.

CARLOS A. HEPP.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,850,125 Brown Mar. 22, 1932 2,240,646 Hagen May 6, 1941 2,308,430 Bolden Jan. 12, 1943 2,451,499 Lambach Oct. 19, 1943 2,539,296 Clentimack Jan. 23, 1951