GB2190402A

GB2190402A - Device to tension the thread during reciprocatory run of a circular knitting machine

Info

Publication number: GB2190402A
Application number: GB08710974A
Authority: GB
Inventors: Milan Fucik
Original assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Current assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Priority date: 1986-05-12
Filing date: 1987-05-08
Publication date: 1987-11-18
Also published as: CS255135B1; IT8720478A0; IT1204591B; DE3715814A1; CS340686A1; GB8710974D0; GB2190402B

Description

1 GB2190402A 1

SPECIFICATION Fig. 3 is a section on line A-A in Fig. 1;

Fig. 4 shows a modification of the device in Device to tension the thread being laid dur- the position when the thread is taken-off by ing reciprocatory run of a circular knitting the needles; and machine 70 Fig. 5 shows the modification in the posi tion when the thread is pulled out during reci The invention relates to a device to tension procatory run.

the thread being laid during reciprocatory run A known small diameter circular knitting ma of a circular knitting machine for the pro- chine is provided with knitting feeds, one of duction of socks and the like. 75 which is arranged to knit in reciprocatory run.

Small diameter knitting machines are known Said knitting feed is provided with a known, which knit the heels or the toes of hosiery or not shown, thread guide to guide the thread socks knitted by reciprocatory run. When even during reciprocatory run of the machine.

knitting reciprocatorily the thread being fed in Between said thread guide and the bobbin on the moment of change of the needle cylinder 80 the machine frame there is a device to tension rotation is transferred by the needle to the the thread during reciprocatory run of the ma second point of catching by the needles and it chine. Said device contains a shaped holder 1 is slackened. For the thread to be continu- attached to said frame. Lever 3 is swingably ously tensioned and at the same time to avoid mounted on pin 2 in holder 1 and at one end unwinding of the thread from the bobbin, the 85 of lever 3 there is an eye 4 to guide thread P thread is tensioned by an eye on a spring- to the thread guide. On the other arm of lever loaded lever, which at the same time releases 3 there are separately attached ends of ten the opened disks of the brake and the latter sion springs 5, 6 and the other ends of said clamps the thread which is thus tensioned in springs are attached to rods 7 and 8. Rods 7, the space between the thread brake and the 90 8 are shiftably adjustable by means of screws thread guide. The lever with the eye controls in cubes 9, 10 in holder 1. Beside the lever 3 the brake disks directly or by means of a there is second lever 11 swingably mounted spring-loaded rod. The operation of said de- on pin 2 and the upper end of said second vice depends on the actual operation of the lever 11 is provided with elastic element 12 thread brake which during the operation with 95 arranged opposite to flat surface 13. Flat sur irregular thread material loses its efficiency so face 13 is provided on holder 1. On the sec that pulling out of the thread from the bobbin ond arm of lever 11 on horizontal part of said takes place. arm an eye 14 is fixed and to said eye 14 a The object of the invention is to eliminate stop 15 is fixed (Fig. 3), said stop being pro the above mentioned disadvantage. 100 vided with a recess for the lever 3. Further on According to the invention there is provided holder 1 is fixed a disk thread brake 16 under a device to tension the thread being laid dur- the surface 13 and the eye 17 above the ing reciprocatory run of a circular knitting ma- surface 13. On the holder 1 there is also a chine for the production of socks and the like, stop 18 for the second lever 11. Beside the comprising a springloaded lever with an eye 105 lever 11 a lever 19 is swingably mounted on to guide the thread towards the thread guide, pin 2, end enlargement 20 of the core 21 of a second lever with an elastic element as- a Bowden cable 21 is fixed to said lever 19, signed to a fixed surface so that the thread and said core 21 is controlled by a not shown passes between them towards the eye of command device of the machine.

spring-loaded lever while both levers are mu- 110 The operation of the above described device tually movably coupled. is as follows. When knitting rotary, the wire The advantage of the device according to 21 is pulled and the lever 19 presses onto the invention is the fact that the thread is not the lever 3 and the latter through stop 15 pulled out from the bobbin and thus the de- onto the lever 11 which leans against the vice operates absolutely accurately and 115 stop 18, as evident from Fig. 1. Thread P quickly. Other elements of the design improve passes through the eye 17, is braked by the both the stability of the whole device and the thread brake 16 and further passes straight course of elastic force of the lever with the through the eyes 14 and 4 and further to the eye. The use of elastic element enables to use thread guide. Due to the fact that the lever 3 the disk thread brake only to brake regardless 120 leans against stop 15, the whole system is of its blocking when holding the thread during rigid and no vibrations can take place during reciprocatory run. knitting and consequently no undesirable brak Embodiments of the invention will now be ing of the thread in the eyes 14, 4 except for described, by way of example, with reference braking in the disk thread brake 16. During to the accompanying drawings, in which: 125 reciprocatory knitting the core 21 is slackened Fig. 1 shows the device in the position and the lever 19 does not act on the lever 3.

when the thread is taken-off by the needles; Due to the drawing force of the thread P, the Fig. 2 shows the same device in the posi- lever 3 remains in original position, that is tion when the thread is pulled out during reci- always when the needles knit the thread P, procatory run; 130 but in the places of changing the direction of 2 GB2190402A 2 the needle cylinder rotation, when the needles During reciprocatory knitting the core 21 stop knitting the thread P, due to the action swings the lever 190 against the action of the of springs 5 and 6 a swing of the lever 3 spring 113. In the place of changing the direc takes place and thus the thread P between tion of the needle cylinder rotation, where the the eye 4 and the thread guide is tensioned, 70 needles stop to knit the thread F, first the as evident in Fig. 2 and the thread is pulled spring 5 and after that the spring 6 begins to out from the thread guide. But simultaneously swing the lever 3 as much as the thread P the thread P by its tension swings also the permits, which ensures constant tensioning of lever 11 by affecting the eye 14 and elastic the thread P. But simultaneously the lever 3 element 12 causes clamping of the thread P 75 stops acting on the lever 110 which swings so that is presses the thread onto the surface due to the tension of the spring 11 so that N 13. This ensures pulling the thread P out only the elastic element 12 presses the thread P from the thread guide, ie. in the direction from onto the surface 13 and the thread P is firmly the needles. When the needles begin to knit clamped as evident in Fig. 5. The thread P is the thread P again, the lever 3 returns into its 80 pulled out only from the needles and is ten original position due to the pull of the thread sioned, while it leans against the horizontal P. But simultaneously the thread P stops to part of the cranked rod 112. As soon as the affect the eye 14 of the lever 11 and releases needles begin to knit the thread P again, the it. Thus the elastic element 12 stops holding lever 3 returns to its original position due to the thread P and the lever 3 returns the lever 85 the pull of the thread P and simultaneously it 11 into original position via the stop 15, while presses on the lever 110 and returns it in the the thread P has already been taken-off by the original position. Thus the elastic element 12 needles. stops acting on the thread P and said thread The force of the springs 5 and 6 is adjusted can be withdrawn from the bobbin again.

by moving the rods 7 and 8 so that during 90 Further the elastic element can be made the swing of the lever 3 -it is possible to within the scope of the invention like a stone obtain constant force acting on the thread P. made from polyurethane.

Said adjustment can be advantageously used

Claims

for various types of threads. CLAIMS

Another modification of the device accord- 95 1. A device to tension the thread being laid ing to the invention is illustrated in Fig. 4. The during reciprocatory run of a circular knitting difference as compared with the previous de- machine for the production of socks and the vice is in the following parts. Instead of the like, comprsing a spring- loaded lever with an lever 11 there is lever 110 arranged on pin 2, eye to guide the thread towards the thread only with elastic element 12 arranged in the 100 guide, a second lever with an elastic element same way as with the lever 11. The lower assigned to a fixed surface so that the thread end of the lever 110 is without an eye and it passes between them towards the eye of is made as a stop for the lever 3. Further to spring-loaded lever while both levers are mu the lever 110 one end of tension spring 111 tually movably coupled.

is attached and the other end of said spring is 105 2. A device as claimed in claim 1, wherein attached to lever 190 being used instead of the elastic element is arranged on one arm of the lever 19, ie. so that it acts in the direction the second lever while the other arm is pro of swing of the spring-loaded lever 3 when vided with a second eye to guide the thread pulling out the thread P. Further in the holder towards the eye of the spring-loaded lever.

1 a cranked rod 112 is fixedly arranged, hori- 110 3. A device as claimed in claim 1, wherein zontal part of said cranked rod is in the way the elastic element is arranged on one arm of of the thread P and thus replaces the eye 14. the second lever while to the other arm is One end of tension spring 113 is attached to attached a tension spring, the other end of cranked rod 112 and the other end of said which is attached so that it acts in the direc spring is attached to the lever 190. Upper 115 tion of swing of the spring-loaded lever when arm of the lever 3 is substantially vertical, so pulling out the thread.

that the spring 6 passes just beside the cen- 4. A device as claimed in claim 1, 2 or 3, ter of lever 3 swinging and in non-operational wherein the other arm of the lever than that position it acts on a very small arm and is with elastic element is made as a stop for the adjustable. The other parts of the device are 120 arm of the spring- loaded lever.

as to the operation and arrangement the 5. A device as claimed in any one of claims same. 1 to 4, wherein two tension springs are at Operation of the above described device is tached separately to the arm of the spring as follows. During rotary knitting the core 21 loaded lever and the other ends of said is slackened and the spring 113 holds the 125 springs are attached to shiftably adjustable lever 190 and together with it also the lever 3 rods arranged on the holder of the device.

in the position when it leans against the lower 6. A device as claimed in any one of claims end of the lever 110. Thread P passes freely 1 to 5, wherein the fixed surface is provided through the eyes 17 and 4 and is braked by on the holder of the device.

the thread brake 16. 130 7. A device to tension the thread being laid 3 GB2190402A 3 during reciprocatory run of a circular knitting machine for the production of socks and the like, substantially as hereinbefore described with reference to Figs. 1 to 3 of the accom5 panying drawings.

8. A device to tension the thread being laid during reciprocatory run of a circular knitting machine for the production of socks and the like, substantially as hereinbefore described with reference to Figs., 4 and 5 of the accompanying drawings.

Printed in the United Kingdom for Her Majesty's Stationery Office, Dd 8991685, 1986, 4235. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 'I AY, from which copies may be obtained.