US3754415A

US3754415A - Needle bar drive for warp knitting machine

Info

Publication number: US3754415A
Application number: US00204933A
Authority: US
Inventors: K Kohl
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-12-07
Filing date: 1971-12-06
Publication date: 1973-08-28
Anticipated expiration: 1990-08-28
Also published as: DE2060101C3; GB1347327A; DE2060101A1; DE2060101B2

Abstract

A drive for imparting to a warp knitting machine needle bar a compound motion including a vertically reciprocating component and a substantially horizontal swinging component comprises a control lever rising from a fulcrum. The needle bar is mounted on the outer end of a first control lever arm. A vertically reciprocable push-rod is linked to the control lever fulcrum and a bell-crank lever is linked to the outer end of the second control lever arm, another push-rod rocking the bell-crank lever.

Description

United States Patent [191 Kohl ,[ NEEDLE BAR DRIVE FOR WARP KNITTING MACHINE [76] Inventor: Karl Kohl, 10 Chlorodontstrasse,

Obettshausen, Germany [22] Filed: Dec. 6, 1971 [211 App]. No.: 204,933

[30] Foreign Application Priority Data Dec. 7, 1970 Germany P 20 60 101.8

[52] US. Cl. 66/86 [51] Int. Cl D04b 23/00 [58] Field of Search ..66/83-87 [56] References Cited UNITED STATES PATENTS 3,063,273 [1/1962 Kohl 66/88 [451 Aug. 28, 1973 10/1966 Kohl 66/86 9/1972 Esperson 74/47 Primary Examiner-Ronald Feldbaum Attorney-Kurt Kelman [5 7] ABSTRACT A drive for imparting to a warp knitting machine needle bar a compound motion including a vertically reciprocating component and a substantially horizontal swinging component comprises a control lever rising from a fulcrum. The needle bar is mounted on the outer end of a first control lever arm. A vertically reciprocable push-rod is linked to the control lever fulcrum and a bell-crank lever is linked to the outer end of the second control lever arm, another push-rod rocking the bell-crank lever.

2 Claims, 1 Drawing Figure Patented Aug. 28, 1973 As is known in the operation of warp knitting machines, the vertically reciprocating knitting needles must stand still during each cycle when the needles are in cooperating relation adjacent the yarn guides. This interruption of the reciprocating motion must be con trolled by a suitable construction of the drive, for instance the shape of the cam in the eccentric drive which controls all the machine movements. This causes structural as well as kinetic difficulties.

It is the primary object of this invention to overcome these difficulties and to, provide a simple needle bar drive.

The above and other objects are accomplished in accordance withv the invention with a drive which com:-

prises a control lever having afirst arm and a second dle bar is linked to theouter end of'the-secondcontrol lever arm, this means including another reciprocable push-rod.

In the illustrated embodiment, the-latter means comprises a bell-crank lever having two arms and a fixed fulcrum about which the bell-crank. lever arms are arranged to pivot, one end of one of the arms being linked to the outer end of-the second control lever arm and one end of the other bell-crank lever' arm being linked to the other push-rod. The bell-crank lever extends substantially in the same plane as the control lever or in an adjacent plane parallel thereto, the fixed fulcrum being perpendicular thereto.

With such a drive, the components ofthe compound needle bar motion may be so coordinated that nofurther means or special shaping of the cams of the machine cam drive are required to interrupt the needle bar motion during each cycle. The motion transmitting mechanism of the present invention is exceedingly simple. During the vertical upwardmotion' of the needle bar, when the needles have 'reached'the yarn laying po-' sition, this motionis continued by the movement of the one push-rod which vertically reciprocatesthe control lever but thisupward motion of theneedlebar is neutralized by the fact that the simultaneously efi'ected' rocking of the needle bar moves the needles down by about the same distance so that, in effect, the needles remain at the same horizontal level.

The special arrangement of the needle bar drive according to this invention may also be utilized for driving the guide bar assembly of the machine. This is done by linking a third push-rod to the bell-crank lever, this push-rod being suitably coupled to the yarn guide bar assembly for actuating the movement thereof during the knitting cycle.

The needle. bar mechanism and guide bar assembly mechanism with their eccentric drive for imparting the required knitting cycle motions thereto are well known, the push-rods for the drives being actuated through the medium of an eccentric by a main shaft rotating at uniform speed, as shown, for instance, on pages 16 and 26 of Warp Knitting Technology by Dr. F. Paling, Columbine Press, Manchester & London, England, 2nd Edition, 1965.

A specific embodiment of the invention will be described hereinafter in conjunction with the single FIG- URE of the accompanying drawing schematically showing the essential parts of a drive according to this invention.

The drawing illustrates a control lever 2 having a first arm 4 and a second arm 6, the arms rising from a fulcrum 3 of the lever and enclosing an angle with each other. In other words, the fulcurm of the rocking lever 2 is at the lowest point of the lever. The needle bar 1, in whose lead the knitting needles 5 are embedded, is mounted on the outer end of first control lever arm 4.

A push-rod 10 is linked to control lever fulcrum 3 for imparting a vertically reciprocating motion component to the lever, and thus to the needle bar, the vertical reciprocation of push-rod 10 being effected in a well known manner by an eccentric drive, such as shown on page 16 of Paling, mentioned hereinabove.

A means for imparting a swinging motion component to the needle bar is linked to the outer end of the second control lever arm 7 and includes another push-rod 7'vertically reciprocated in a like manner. In the illustrated embodiment, this means comprisesa bell-crank lever 8. One end of one of the bell-crank lever arms is linked to the outer end of control lever arm 6 while one end ofthe other bell-crank lever arm is linked to pushrod 7, thetwo bell-crank lever arms being arranged to pivot about fixed fulcrum 9 so that the vertical reciprocation of pushrod 7 is translated into a rocking motion of control lever 2.

As the two push-rods are cyclically reciprocated, the reciprocation of push-rod 10 will cause the knitting needles to be moved up and down in the direction of arrow 1 1 while they are swung in the direction of arrow 12. These two motion components are so correlated that the needles move substantially in the direction of arrow 13 in the yarn laying position of the needles adjacent the yam guides. In other words, the needles undergo no vertical motion at this stage of the knitting cycle without the necessity of giving any special shape to the cam of the eccentric drive (not shown) for this purpose.

In the embodiment herein shown, a third push-rod 15 is linked to the arm 14 of the intermediate or transmission lever 8. This pu'sh-rod is suitably coupledto the guide bar assembly 16 of the warp knitting machine to actuate the swinging movement of this assembly during the knitting cycles, the swinging mechanism per se being well known, as shown, for instance, on pages 24 M26 ofPaling, mentioned hereinabove.

The vertical reciprocating motion component and swinging motion components are so coordinated and correlated that they combine at the point where the knitting needles are in the yarn laying position adjacent the yarn guides so that the needles stand virtually still in the vertical direction at this point.

I claim:

I. A drive in a warp knitting machine for moving a guide bar assembly and a needle bar carrying knitting needles of the machine through the stages of a knitting 3 4 cycle, including a yarn laying stage wherein the knitting the guide bar assembly for actuating the knitting needles remain substantially motionless, the drive comcycle movement thereof in response to the recipro- Prising cation of the second push-rod, and

a comfol lever having two ends and a fulcrum 6. the reciprocation of the push-rods imparting the termedate the lever ends 5 vertically reciprocating and the swinging motion 2. the needle bar being mounted on one of the lever components to the needle bar being so coordinated 3 21: vertican rgci h d r k d and correlated that the needles remain substany pmea e pus to m e to tially motionless in the yarn laying stage of the knitthe control lever fulcrum for imparting a vertically g cycle reciprocating motion component to the needle bar, 10

4. asecond reciprocable push-rod linked to the oppo- The dnve chum further compnsmg a bell Site control lever end for imparting a swinging crank lever having two arms and a fixed fulcrum about tion component to the neede bar by Swinging the which the bell-crank lever arms are arranged to pivot,

one end of one of the bell-crank lever arms being lever about the fulcrum, the f l being disposed below a Straight line linked to the opposite end of the control lever, and one end of the other bell-crank lever arm being linked to extending from the needles to the opposite control lever end, the second push-rod.

5. a transmission between the second push-rod and

Claims

1. A drive in a warp knitting machine for moving a guide bar assembly and a needle bar carrying knitting needles of the machine through the stages of a knitting cycle, including a yarn laying stage wherein the knitting needles remain substantially motionless, the drive comprising 1. a control lever having two ends and a fulcrum intermediate the lever ends, 2. the needle bar being mounted on one of the lever ends, 3. a first vertically reciprocable puSh-rod linked to the control lever fulcrum for imparting a vertically reciprocating motion component to the needle bar, 4. a second reciprocable push-rod linked to the opposite control lever end for imparting a swinging motion component to the needle bar by swinging the lever about the fulcrum, a. the fulcrum being disposed below a straight line extending from the needles to the opposite control lever end, 5. a transmission between the second push-rod and the guide bar assembly for actuating the knitting cycle movement thereof in response to the reciprocation of the second push-rod, and 6. the reciprocation of the push-rods imparting the vertically reciprocating and the swinging motion components to the needle bar being so coordinated and correlated that the needles remain substantially motionless in the yarn laying stage of the knitting cycle.

2. the needle bar being mounted on one of the lever ends,

2. The drive of claim 1, further comprising a bell-crank lever having two arms and a fixed fulcrum about which the bell-crank lever arms are arranged to pivot, one end of one of the bell-crank lever arms being linked to the opposite end of the control lever, and one end of the other bell-crank lever arm being linked to the second push-rod.

3. a first vertically reciprocable puSh-rod linked to the control lever fulcrum for imparting a vertically reciprocating motion component to the needle bar,

4. a second reciprocable push-rod linked to the opposite control lever end for imparting a swinging motion component to the needle bar by swinging the lever about the fulcrum, a. the fulcrum being disposed below a straight line extending from the needles to the opposite control lever end,

5. a transmission between the second push-rod and the guide bar assembly for actuating the knitting cycle movement thereof in response to the reciprocation of the second push-rod, and

6. the reciprocation of the push-rods imparting the vertically reciprocating and the swinging motion components to the needle bar being so coordinated and correlated that the needles remain substantially motionless in the yarn laying stage of the knitting cycle.