GB2234531A

GB2234531A - Apparatus for displacing guide bars on a warp knitting machine

Info

Publication number: GB2234531A
Application number: GB9009867A
Authority: GB
Inventors: Bertram Frenzel; Wolfgang Graf; Michael Schultheib
Original assignee: Kombinat Textima VEB
Current assignee: Kombinat Textima VEB
Priority date: 1989-07-11
Filing date: 1990-05-02
Publication date: 1991-02-06
Also published as: FR2649729A1; DE4007513A1; DD286629A5; GB9009867D0; DE4007513C2; FR2649729B1

Abstract

Apparatus for controlling the offset movements of guide bars (2-4) of a warp knitting machine employs a rotatable pattern device (1) equipped with cam discs (13) or the like which engage with rollers (82, 92, 102) or pivotable elbow levers (81, 91, 101), which levers (18, 91, 101) have offset pivot joints (83, 93, 103) and are coupled to push rods (5, 6, 7) which operate the guide bars (2, 3, 4), the guide bars and push rods being arranged vertically above one another. The arrangement makes it possible to use favourable transmission angles. The pivots (83, 93, 103) are preferably offset relative to one another in all three directions. <IMAGE>

Description

i 4 f- 1 CC.NTIROLLING THE 077FSET TS CIF GUIDE BARS ON A CHAIN KNITTING

MACHINE, ESPECIALLY A SEW-KNITTING MACHINE The present invention relates in general to knitting machines and more particularly to apparatus for controlling offset movements of guide bars on such machines.

in a known machine, described in DE AS 1,288,228, a pattern device is rotated about a horizontal axis and I.i,an-,.tEr tInrust to p,.sh rods colli-31ed to the L.,uide rods. The elbow levers, are all pivoted at one common pivot joint. This machine is suitable for operating guice bars staggered horizontally one behind another, their eye-pointed needles being mounted approximately perpendicularly to the axis of rotation of the pattern device.

If at least two guide bars are to be provided vertically one above another, so that the eye-pointed needles are positioned approximately parallel to the axis of rotation of the pattern device, as is for example necessary on sew-knitting machines, then the described apparatus can disadvantages.

be used only with considerable It is necessary in the case of at least one guide bar, to give the pusher an inclined starting position or to rotate the entire apparatus through 900 2 or, if all the pushers must be articulated in the central longitudinal axes of the guide bars, to maIze at least ene of the elbow levers shorter or longer. An inclined starting position for one or more guide bar pushers leads to unfavourable transmission angles and to a defective force application to the relevant guide bar. A guide bar with an inclined pusher is then subject to lateral forces.

If the entire known machine is rotated through 900, 1hen technical problems that are di.f'fici,'--, to resolve in --e!:pect of bearings, Lsiiidance and lubrication of- the components are encountered. If one or more elbow levers are shortened or lengthened, compared with at least one unchanged elbow lever, then this arrani2ement does indeed an articulation of all the pushers in the direction of the central longitudinal axes of the guide bars, but requires a larger number of different basic types of pattern carriers or also unfavourable transmission angles.

An object of the present invention is to create an apparatus for controlling the guide rods using favourable transmission angles in which at least two guide bars provided vertically above one another can be controlled while nevertheless retainine the horizontal oricntation of the axis of rotation of the pattern device so an increase in the number of different basic 'types of c 3 i pItern carriers is avoided.

E- t The objective of the invention is ici-iie..-ed in that at least two guide bar pushers are disposed vertically one above another and are connected with at least two guide bars, likewise mounted vertically one above another, which guide bars are equipped with eye-pointed needles fixed approximately parallel to the axis of rotation of the pattern device, and that each pusher is coupled to an offset elbow lever, the pivot joint of which has a position different from the pivot joint of another offset elbow lex,er.

According to the invention there is provided a,--,paratus for controlling offset movements of guide bars having eye-pointed needles on a chain knitting machine and especially a sew-knitting machine; said apparatus comprising a pattern det-ice rotatable about a horizontal axis generally parallel to the needles and pivotal elbow levers provided between the pattern device and guide bar pu-hers located approximately on the central longitudinal axes of the guide bars and connected in articulated manner to the zuide bars to transmit thrust to the pushers as the pattern device rotates; wherein the guide bars and guide bar pushers are disposed vertically above one another and the elbow levers have pivot joints offset in different nositions to one another.

A preferred form of embodiment is characterised in that the position of the pivot joint of each offset elbow i 4 lever is different from the position of a pivot point of,-,nc4t,licr offset elt,o-, lever in three spatial coordinates.

With the invention, a favourable form of the transmission angles can be effected, and lateral forces do not occur on the guide bars. The number of necessary basic types of pattern carriers remains closely limited. As a consequence of the retention of the horizontal axis of rotation of the pattern device, lubrication problems do not arise. The apparatus may with advantage be used for operating guide bars staggered -.-ertically one above another.

The elbow levers may each have inclined arms with an Ei-n,e:. at, the associated pivot, joint. The arms ira- the same length and indeed all the arms may have the same length to provide equal lever ratios.

A more detailed explanation of the invention now follows with reference to an example of embodiment thereof.

In the drawing:

Figure 1 is a schematic front view of apparatus constructed in accordance with the invention; Figure 2 is a plan view of the apparatus.

As shown in the drawing, the apparatus employs a pattern device 1 rotatably mounted on a bearing 11 with an axis of rotation 12 which is horizontal. The pattern tle,.--ice 1 effects offset movements of guide bars 2, 3, 4, bearing and 1 1 vert-,call.y cne above another and the de\nice 1 can use cam discs 13, 14, 15. as shown, or pattern chains or equivalent pattern carriers. The cam discs 13, 14, 15 are shown as circles of uniform diameter for simplicity. The guide bars 2, pushers 5, 6, 7, pusher 5, 6, 7, approximately on ass. ociated guide pushers 5, 6, 7, connected in an le-,.-e- 8, 3, 4, are connected with guide bar in an articulated manner, with each disposed in its starting position the central longitudinal axis of the bar 2, 3, 4. The ends of the guide bar remote f rom the guide bars 2, 3, 4, are articulated manner to pivotal offset 91 10. The latter functic,n as transmission means for the offset movements initiated by the pattern device 1. The elbow levers 8, 9, 10 have arms 81, 91, 101 nearest to the cam discs 13, 14, 15, which carry rollers 82, 92, 102 for picking up the movement of the cam paths.

3, 4, have the usual eye-pointed The j,tiide bars needles 21,31,41, positioned approximately parallel to the axis of rotation 12 of the pattern device 1. Because favourable transmission angles must be used, the guide bar pushers 5, 6, 7 are also situated vertically above one another.

The offset elbow levers 8, 9, 10 possess pivot joints 83, 93, 103, which are situated in different positions. The levers 8, 9, 10 preferably each possess two arms of equal length, which have their apex point at 6 the pivot joints 83, 93, 103. These arms of the levers c (3 ,j, -1 10 are also in the preferred embodiment- of ec;u.,-1 length to one another, so that equal lever ratios are present for all the levers 8, 9, 10. This provides favourable transmission angles, without the necessary number of different basic types of pattern carriers needing to be increased. Of course, thd offset elbow levers 8,9,10, may be of different lengths, with the same lever ratio for all the levers 8,9,10 and with equal arm lengths of each individual lever 8,9,10. The offset elbow levers 8,9,10 may also each be aiven arms of unequal lengths, without the lever ratios being differenz fron, one another. Fij.iall-,., it is also conceivaL.le to give the levers 8,9,10 arms of unequal lengths, to - 1= thereby create different lever ratios.

The different positions of the pivot points 83, 93, 103 relate to differences in one, two or three spatial coordinates. A difference in position which is characterised by differences in all three spatial coordinates constitutes the preferred variant.

t_ 11 i 1 7 C LX, 1 "'., S 1. Apparatus for controlling offset movements of guide bars having eye-point needles on a chain knitting machines and especially a sew-knitting machine; said apparatus comprising a pattern device rotatable about a horizontal axis generally parallel to the needles and pivotal elbow levers provided between the pattern device and guide bar pushers located approximately on the central longitudinal axes of the guide bars and connected in articulated manner to the guide bars to transmit to the pushers as the patterii rctates; wlierein the guide bars and guide bar pushers are dsposed vertically above one another and the elbow levers have pivot joints offset in different positions to one another.

1) Apparatus according to claim 1, wherein the position of the pivot joint of each elbow lever differs from the position of the pivot joint of at least one other elbow lever in three spatial coordinates.

3. Apparatus according to claims.1 or 2, wherein each of the offset elbow levers has arms which have theirapex point at the associated pivot joint.

8 I 4. Apparatus according to claim 3, wherein the arms of each offset elbow lever have the same length.

5. Apparatus according to claim 4, wherein the arms of all the offset pivot levers have the same length.

1.

6. Apparatus according to claim 1 or 2, wherein all the offset elbow levers have equal lever ratios.

7. Apparatus according to any one of clainis 1 to 6 wherein the pattern device comprises cam discs.

i i 1 8. Apparatus according to claim 7, wherein the offset elbow levers are provided with rollers engaging uith the cam discs.

9. Apparatus substantially as described with reference to, and as illustrated in, the accompanying drawing.

z Publ shed 1991 at The Patent Office, State House. 66/71 High Holborn. London WC] R 477P. Further copies may be obtained from 11 Sales Branch. Unit 6, Nine Mile Point. C%vinfelinfach, Cross Keys. Newport, NP) 7RZ. Printed by Multiplex techniques ltd, St MarY Cray. Kent.