GB2192903A

GB2192903A - Stitch cam control device

Info

Publication number: GB2192903A
Application number: GB08717411A
Authority: GB
Inventors: Pavel Uhlir
Original assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Current assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Priority date: 1986-07-24
Filing date: 1987-07-23
Publication date: 1988-01-27
Also published as: CS561886A1; IT1222036B; GB8717411D0; IT8721294A0; DE3724124A1; CS257038B1; GB2192903B

Description

GB2192903A 1

SPECIFICATION sible lever to the other arm of which a tie-rod

12 is connected. The other end of the tie-rod Stitch cam control device 12 is connected to [ever 13 being fixed on a shaft 14' of a step motor 14.

The invention relates to a stitch cam control 70 Instead of a step motor it is possible to use device in a circular knitting machine for the a servomotor comprising e.g. an asynchronous production of hosiery and the like goods. electric motor. The step motor 14 is via elec Circular knitting machines are known where trical lead 15 connected with a control micro the stitch cams or the cams controlling the computer 16 of the machine. Step motor 14 density are fixed on a slide located movably 75 is stationary arranged on the stand 11 which parallel to the axis of the needle cylinder. in turn is fixed by means of screws 17' to a Change in the axial position of the stitch cam flange 17 of the machine.

is performed by a kinematic transmission from Operation of the above described device is a mechanical control device, e.g. a control as follows. During operation of the machine, drum and in recent machines by a step motor 80 the step motor 14 moves lever 13 according or servomotor controlled by a control micro- to the command of the control microcomputer computer of the machine. 16 of the machine. By means of the tie-rod But said device solves the control of the 12 and rocker lever 7 said motion is trans stitch cams only in connection with the ferred to carrier 6 and thus to the stitch cam change of the density. When knitting some 85 4 or counter cam 4'. With regard to that, the kinds of hosiery goods it is necessary to carrier 6 is a part of a joint mechanism, each move said cams also radially and to move of its points and thus each point of the stitch them out of engagement with the needle cam 4 and counter cam 4' being movable butts. along an arc of a circle of radius R which The object of the invention is to solve in a 90 corresponds to the distance of the axes of simple way the control of the stitch cams axi- pins 7', 10 or 8' 9. For example, for the point ally and radially and especially in connection K on the stitch cam 4 it is the arc k. The with the control by a step and the like motor. position of the point K corresponds to the According to the invention there is provided lowest axial position of the stitch cam 4, to a stitch cam control device in a circular knitt- 95 this corresponds also the position of the lever ing machine for the production of hosiery and 13 being characterised by point P on said the like goods, wherein a carrier of a stitch lever 13. By turning the lever 13 its point P cam is arranged like a connecting element of moves along an arc p and thus the point K rocker levers of a joint mechanism, of which along the arc k. Up to point P' on the arc p or one is kinematically connected with an operat- 100 up to point K' on the arc k the stitch cam 4 ing means of a control device of the machine. moves with regard to the butts of the needles The advantage of the invention is the fact 3 so that it in fact adjusts the depth of sink that by one operating means it is possible to ing the needles 3 or the density of the fabric, control both the extent of the densities of a because here it is in contact with the butts of stitch cam, and its movement out of engage- 105 the needles 3. During further motion of the ment with the needle - butts. Said solution sim- lever 13 along the arc p behind point P', e.g.

plifies the whole control of the cams, while in the position in point P" the point K gets advantageously it is possible to use a step into the position K", the stitch cam 4 gets out motor or the like motor controlled by the mi- of engagement with the butts of the needles crocomputer of the machine. 110 3, and hence it is moved radially from the An exemplary embodiment of the device ac- needle cylinder into a non- operating position.

cording to the invention is illustrated in the When moving into the nonoperational posi accompanying drawing. A known circular knitt- tion and vice versa, the stitch cam 4 co-oper ing machine for the production of hosiery and ates in a known way with long and short the like goods is provided with a needle cylin- 115 butts of the needles 3. The size of the radius der 1 in the longitudinal tricks 2 of which R is selected so that radical motion of the there are located needles 3 and under the cam track towards the needle cylinder 1 in the needles there are jacks (not shown). Each moment when point K operates in the area of knitting feed is provided with a stitch cam 4 the arc k between the points K and K' is and respective counter cam 4' to create the 120 insignificant with regard to axial component of stitches. Stitch cam 4 is fixed to a carrier 6 the motion.

by means of a screw 5 and counter cam 4' is Various modifications can be performed fixed to the same carrier 6 by means of a within the scope of the invention. For example screw (not shown). The carrier 6 is located in a machine with mechanical control device movably on pins 7', 8' or rocker levers 7, 8 125 the step motor or servo- motor as an operat which are, by further pins 9 and 10, swinga- ing means of a control device is substituted bly mounted in a stand 11. Rocker levers 7, 8 by a cam on the surface of a control drum and carrier 6 like their connecting element crefrom where mechanical kinematic transmission ate thus a four-joint mechanism. The rocker is connected to the rocker lever 7.

lever 7 is made in the form of double-rever- 130 2 GB2192903A 2

Claims

1. A stitch cam control device in a circular knitting machine for the production of hosiery and the like goods, wherein a carrier of a stitch cam is arranged like a connecting element of rocker levers of a joint mechanism, of which one is kinematically connected with an operating means of a control device of the machine.

2. A stitch cam control device according to Claim 1, wherein one rocker [ever is prolonged to an end which is connected to a tierod the other end of which is connected to a lever fixedly located on a shaft of a servomotor or of a step motor.

3. A stitch cam control device according to Claim 2, wherein both rocker levers are located in a stand on a flange of the machine.

4. A stitch cam control device according to Claim 3, wherein in the stand there is located the servomotor or step motor.

5. A stitch cam control device in a circular knitting machine, substantially as hereinbefore described with reference to the accompanying drawing.

Published 1988 at The Patent Office, State House, 66/71 High Holborn, London WC 1 R 4TP. Further copies may be obtained from The Patent Office, Sales.Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Burgess & Son (Abingdon) Ltd. Con. 1/87.