GB2144154A

GB2144154A - Circular knitting machine

Info

Publication number: GB2144154A
Application number: GB08418973A
Authority: GB
Inventors: Milos Dyntar; Jaromir Kucera; Jan Knollmann; Jiri Oliva; Josef Pialek
Original assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Current assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Priority date: 1983-07-28
Filing date: 1984-07-25
Publication date: 1985-02-27
Also published as: IT8422078A0; CS244453B1; IT1210492B; GB2144154B; GB8418973D0; DE3426693A1

Abstract

A circular knitting machine for the production of hosiery and the like goods both in rotary and in reciprocatory knitting, is provided with a sinker ring cover with cams (8, 9) to control the knock over sinkers which co-operate with the needles being controlled by a cam system with at least one knitting feed with a left and a right stitch cam (1,2 or 4,5) for reciprocatory knitting. This invention solves the problem of guiding the knock over sinkers for rotary and reciprocatory run by arranging that the sinker ring cover is swingable within the angle between the knock over points of the left and the right stitch cams (1,2 or 4,5) in a knitting feed so that the active section of the cams (8,9) is aligned with the left stitch cam (1,4) for knitting direction S and with the right stitch cam (2,5) for the opposite knitting direction. The sinker ring cover is entrained by friction and arrested by stop means (13, 100, 101). <IMAGE>

Description

SPECIFICATION Circular knitting machine This invention relates to a circular knitting machine for the production of hosiery and the like goods both by rotary and reciprocatory knitting.

On known single cylinder hosiery knitting machines extension of the knock over sinkers being controlled by the cams in the sinker ring cover is designed so that it takes place in the moment of knock over in the reverse heel cam. Extension of the knock over sinkers again takes place at the moment of knock over in the cam for rotary run, while between the two knock over points of a knitting feed the knitted fabric is not held by the knock over sinkers, consequently in this zone it is not possible to move the needles upwards, because lifting of the knitted fabric would take place.

The object of this invention is to eliminate the above mentioned disadvantage.

According to the invention there is provided a circular knitting machine for the production of hosiery and the like goods both in rotary and in reciprocatory knitting, provided with a sinker ring cover with cams to control knock over sinkers which co-operate with the needles being controlled by a cam system with at least one knitting feed with a left and a right stitch cam for reciprocatory knitting, wherein the sinker ring cover is swingable within the angle between the knock over points of the left and the right stitch cams of a knitting feed.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a schematic layout of the cams in the sinker ring cover with regard to the cams of the two knitting feeds in the position for rotary knitting; Figure 2 shows the same as Figure 1, but the sinker cams are in the position for reverse run of the needle cylinder; and Figure 3 is a radial section of the sinker ring with illustrated needle cylinder.

A known single cylinder hosiery knitting machine is provided with two feeds controlling the not shown needles, both feeds are arranged for reciprocatory knitting. The first feed comprises the left stitch cam 1, the right stitch cam 2 and the central cam 3.

Similarly the second feed comprises the left and right stitch cams 4 and 5 respectively, and the central cam 6. Knock over sinkers 7 (Figure 3) are guided through their butts 70 by the interior cam ring 8 and by the exterior cam ring 9 which are arranged so that for each feed the interior cam ring 8 is provided with one edge 81 or 82 and similarly the exterior cam ring 9 is provided with one edge 91 or 92 for the direction of rotation Sat rotary knitting. For the rotation in reverse direction Si (Figure 2) both cam rings 8,9 are provided with edges 83 or 84 and edges 93 or 94.

Said edges 81 and 83 or 82 and 84 and edges 91 and 93 or92 and 94 link-up with each other as shown in Figures 1 and 2, so that the knock over sinkers 7 are extended only within a very short zone around the place of knock over.

Both cam rings 8 and 9 are firmly arranged in the cover 10 of the sinker ring 11 which is freely located on the sinker ring 11. Sinker ring 11 is firmly arranged on the upper end of the needle cylinder 12.

On the circumference of the cover 10 of the sinker ring 11 there are two stop screws 100 and 101 screwed in the lugs 103 and 104, angular distance a of said lugs is the same as angular distance B between both knock over points 21 and 22, or 23 and 24 in both knitting feeds. Further between the stop screws 100 and 101 there is a fix stop 13 arranged on a not shown plate of the machine.

The operation of the above described arrange mentisthefollowing. During rotary run of the machine in the direction S, the cover 10 with cam rings 8 and 9 is entrained due to friction in the same direction, while the stop screw 101 bears against the fixed stop 13. Cam rings 8 and 9 are in the position shown in Figure 1, where the butts 70 of knock over sinkers 7 are moved out and moved in by the edges 81 and 91, or 82 and 92 and the knock over sinkers 7 are thus extended and retracted in the places of the knock over points 22 and 24 of the left clearing cams 1 and 4, where the stitches are formed from the yarns P1 and P2. Around the rest of the circumference the knock over sinkers 7 are in retracted position.

During reciprocatory knitting,the cover 10 is alternately entrained in the direction S and in the direction S1 (Figure 2), while its limit position is given by the contact of the stop screws 101 and 100 with the fix stop 13. In the limit position when turning in the direction Si the cam rings 8 and 9 are in the position, when in the places of knock over points 21 and 23 the knock over sinkers extend and retract due to the action of edges 82,94 and 83,93.

When turning in the direction S, the operation of the knock over sinkers 7 is the same like already described. Stitches are alternately formed from yarns P1 and P2 in the left or right stitch cams 1,4 or 5,2.

The advantage of this invention is that it enables extension of the loop forming sinkers only in the place of knock over in both directions of rotation of the machine, while in the remaining space the knitted fabric is perfectly held and thus it is possible to lift the needles even in the space between the both knock over points of one knitting feed, which enables a more suitable layout and more perfect shape design of the cam systems of the machines for high speed knitting, especially when using more feeds for reciprocatory knitting. Another advantage is that it is possible to design simple cams in the cover, which ensures smooth run of the knock over sinkers.

1. Circular knitting machineforthe production of hosiery and the like goods both in rotary and in reciprocatory knitting, provided with a sinker ring cover with cams to control knock over sinkers which co-operate with the needles being controlled by a cam system with at least one knitting feed with a left and a right stitch cam for reciprocatory knitting, wherein the sinker ring cover is swingable within the angle between the knock over points of the left and

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Circular knitting machine This invention relates to a circular knitting machine for the production of hosiery and the like goods both by rotary and reciprocatory knitting. On known single cylinder hosiery knitting machines extension of the knock over sinkers being controlled by the cams in the sinker ring cover is designed so that it takes place in the moment of knock over in the reverse heel cam. Extension of the knock over sinkers again takes place at the moment of knock over in the cam for rotary run, while between the two knock over points of a knitting feed the knitted fabric is not held by the knock over sinkers, consequently in this zone it is not possible to move the needles upwards, because lifting of the knitted fabric would take place. The object of this invention is to eliminate the above mentioned disadvantage. According to the invention there is provided a circular knitting machine for the production of hosiery and the like goods both in rotary and in reciprocatory knitting, provided with a sinker ring cover with cams to control knock over sinkers which co-operate with the needles being controlled by a cam system with at least one knitting feed with a left and a right stitch cam for reciprocatory knitting, wherein the sinker ring cover is swingable within the angle between the knock over points of the left and the right stitch cams of a knitting feed. An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a schematic layout of the cams in the sinker ring cover with regard to the cams of the two knitting feeds in the position for rotary knitting; Figure 2 shows the same as Figure 1, but the sinker cams are in the position for reverse run of the needle cylinder; and Figure 3 is a radial section of the sinker ring with illustrated needle cylinder. A known single cylinder hosiery knitting machine is provided with two feeds controlling the not shown needles, both feeds are arranged for reciprocatory knitting. The first feed comprises the left stitch cam 1, the right stitch cam 2 and the central cam 3. Similarly the second feed comprises the left and right stitch cams 4 and 5 respectively, and the central cam 6. Knock over sinkers 7 (Figure 3) are guided through their butts 70 by the interior cam ring 8 and by the exterior cam ring 9 which are arranged so that for each feed the interior cam ring 8 is provided with one edge 81 or 82 and similarly the exterior cam ring 9 is provided with one edge 91 or 92 for the direction of rotation Sat rotary knitting. For the rotation in reverse direction Si (Figure 2) both cam rings 8,9 are provided with edges 83 or 84 and edges 93 or 94. Said edges 81 and 83 or 82 and 84 and edges 91 and 93 or92 and 94 link-up with each other as shown in Figures 1 and 2, so that the knock over sinkers 7 are extended only within a very short zone around the place of knock over. Both cam rings 8 and 9 are firmly arranged in the cover 10 of the sinker ring 11 which is freely located on the sinker ring 11. Sinker ring 11 is firmly arranged on the upper end of the needle cylinder 12. On the circumference of the cover 10 of the sinker ring 11 there are two stop screws 100 and 101 screwed in the lugs 103 and 104, angular distance a of said lugs is the same as angular distance B between both knock over points 21 and 22, or 23 and 24 in both knitting feeds. Further between the stop screws 100 and 101 there is a fix stop 13 arranged on a not shown plate of the machine. The operation of the above described arrange mentisthefollowing. During rotary run of the machine in the direction S, the cover 10 with cam rings 8 and 9 is entrained due to friction in the same direction, while the stop screw 101 bears against the fixed stop 13. Cam rings 8 and 9 are in the position shown in Figure 1, where the butts 70 of knock over sinkers 7 are moved out and moved in by the edges 81 and 91, or 82 and 92 and the knock over sinkers 7 are thus extended and retracted in the places of the knock over points 22 and 24 of the left clearing cams 1 and 4, where the stitches are formed from the yarns P1 and P2. Around the rest of the circumference the knock over sinkers 7 are in retracted position. During reciprocatory knitting,the cover 10 is alternately entrained in the direction S and in the direction S1 (Figure 2), while its limit position is given by the contact of the stop screws 101 and 100 with the fix stop 13. In the limit position when turning in the direction Si the cam rings 8 and 9 are in the position, when in the places of knock over points 21 and 23 the knock over sinkers extend and retract due to the action of edges 82,94 and 83,93. When turning in the direction S, the operation of the knock over sinkers 7 is the same like already described. Stitches are alternately formed from yarns P1 and P2 in the left or right stitch cams 1,4 or 5,2. The advantage of this invention is that it enables extension of the loop forming sinkers only in the place of knock over in both directions of rotation of the machine, while in the remaining space the knitted fabric is perfectly held and thus it is possible to lift the needles even in the space between the both knock over points of one knitting feed, which enables a more suitable layout and more perfect shape design of the cam systems of the machines for high speed knitting, especially when using more feeds for reciprocatory knitting. Another advantage is that it is possible to design simple cams in the cover, which ensures smooth run of the knock over sinkers. CLAIMS

1. Circular knitting machineforthe production of hosiery and the like goods both in rotary and in reciprocatory knitting, provided with a sinker ring cover with cams to control knock over sinkers which co-operate with the needles being controlled by a cam system with at least one knitting feed with a left and a right stitch cam for reciprocatory knitting, wherein the sinker ring cover is swingable within the angle between the knock over points of the left and the right stitch cams of a knitting feed.

2. Circular knitting machine according to Claim 1, wherein the sinker ring cover is provided with cam rings having a profile to extend the knock over sinkers in the knitting feed only in the neighbourhood of the knock over point.

3. Circular knitting machine according to Claim 1, wherein on the circumference of the cover there are lugs with stop screws, the angle between which corresponding to the angle between the knock over points of the cams in the knitting feed for reciprocatory knitting.

4. Circular knitting machine substantially as hereinbefore described with reference to the accompanying drawings.