CA1037273A - Circular knitting machine - Google Patents
Circular knitting machineInfo
- Publication number
- CA1037273A CA1037273A CA289,765A CA289765A CA1037273A CA 1037273 A CA1037273 A CA 1037273A CA 289765 A CA289765 A CA 289765A CA 1037273 A CA1037273 A CA 1037273A
- Authority
- CA
- Canada
- Prior art keywords
- fabric
- take
- knitting machine
- roll
- circular knitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Knitting Machines (AREA)
Abstract
CIRCULAR KNITTING MACHINE
Abstract of the Disclosure An improved circular knitting machine which provides for semi-automatic doffing of large diameter rolls of knit fabric.
The doffing of the fabric can be accomplished by a woman operator without strain. Further, the improved circular knitting machine provides an oxbow rod to prevent pattern skewing and a control means to coordinate the fabric take-down speed with the fabric take-up speed.
Abstract of the Disclosure An improved circular knitting machine which provides for semi-automatic doffing of large diameter rolls of knit fabric.
The doffing of the fabric can be accomplished by a woman operator without strain. Further, the improved circular knitting machine provides an oxbow rod to prevent pattern skewing and a control means to coordinate the fabric take-down speed with the fabric take-up speed.
Description
It is an object of the invention to provide a more efficient circular knitting machine which will allow the production of large rolls of fabric which can be more readily doffed from the knitting machine.
According to one broad aspect, the present invention provides a circular knitting machine comprising: means to -~
produce a knitted fabric, means to take up the knitted fabric produced and a semi-automatic means to mechanically doff the fabric from the means to take up the fabxic, said semi-automatic - 10 means including a pair of spaced lever arms pivotally connected to said machine, a handle means extending between and connected `~-to said lever arms, said lever arms each having a groove on the inside surface thereof with one side of said groove on each lever arm being longer than the other side of each groove, said means to take up the knitted fabric including a shaft adapted -to be slidably mounted at each end in said grooves.
Other objects and advantages of the invention will ; become clearly apparent as the specification proceeds to i describe the invention with reference to the accompanying .: i -20 drawings, in which: ¦
Figure 1 is a front elevation partially schematic view .,. . I ~
` of a circular knitting machine incorporating the novel doffing ~ -~- apparatus.
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~037273 Figure 2 is a view taken on line 2-2 of Figure 1 showing one side of the take-down and take-up arrangement;
Figure 3 is a view taken on line 3-3 of Figure 1 showing the other side of the take-down and take-up apparatus;
Figures 4 and 5 are views taken on line 45-45 of Figure 1 showing the take-up roll partially doffed (Figure 4) and In the full doffing position (Figure 5);
Figure 6 i3 a top section view taken on line 6-6 of Figure 3; and Figure 7 is a top view of the secondary spreader bar.
Looking now to Figure 1 there is shown a conventional double knit circular knittlng machine 10 supplied with a plurality of yarns from an off-side creel (not shown). The ,,~ yarn is supplied through the yarn guide ring 12 to the rotating ~ `
needle cylinder 14 whereat it is knit into a tube of fabric F.
The fabric F from the needle cylinder 14 passes downwardly - over a conventional spreader bar 15 to spread it into a flat - ~ shape and then passes under the oxbow shaped rod 16 and over ;:. .
; the secondary spreader bar 17 to the driven take-down rolls ; 20 18 and 20 which are off-set rearwardly from the centerline of the knitting machine. From the take-down rolls 18 and 20 the ; flattened fabric F is delivered to the take-up roll 22 which i6 -driven by surface drive roll 24 which is also off-set rear-.. .
wardly from the centerline of the knitting machine.
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According to one broad aspect, the present invention provides a circular knitting machine comprising: means to -~
produce a knitted fabric, means to take up the knitted fabric produced and a semi-automatic means to mechanically doff the fabric from the means to take up the fabxic, said semi-automatic - 10 means including a pair of spaced lever arms pivotally connected to said machine, a handle means extending between and connected `~-to said lever arms, said lever arms each having a groove on the inside surface thereof with one side of said groove on each lever arm being longer than the other side of each groove, said means to take up the knitted fabric including a shaft adapted -to be slidably mounted at each end in said grooves.
Other objects and advantages of the invention will ; become clearly apparent as the specification proceeds to i describe the invention with reference to the accompanying .: i -20 drawings, in which: ¦
Figure 1 is a front elevation partially schematic view .,. . I ~
` of a circular knitting machine incorporating the novel doffing ~ -~- apparatus.
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~037273 Figure 2 is a view taken on line 2-2 of Figure 1 showing one side of the take-down and take-up arrangement;
Figure 3 is a view taken on line 3-3 of Figure 1 showing the other side of the take-down and take-up apparatus;
Figures 4 and 5 are views taken on line 45-45 of Figure 1 showing the take-up roll partially doffed (Figure 4) and In the full doffing position (Figure 5);
Figure 6 i3 a top section view taken on line 6-6 of Figure 3; and Figure 7 is a top view of the secondary spreader bar.
Looking now to Figure 1 there is shown a conventional double knit circular knittlng machine 10 supplied with a plurality of yarns from an off-side creel (not shown). The ,,~ yarn is supplied through the yarn guide ring 12 to the rotating ~ `
needle cylinder 14 whereat it is knit into a tube of fabric F.
The fabric F from the needle cylinder 14 passes downwardly - over a conventional spreader bar 15 to spread it into a flat - ~ shape and then passes under the oxbow shaped rod 16 and over ;:. .
; the secondary spreader bar 17 to the driven take-down rolls ; 20 18 and 20 which are off-set rearwardly from the centerline of the knitting machine. From the take-down rolls 18 and 20 the ; flattened fabric F is delivered to the take-up roll 22 which i6 -driven by surface drive roll 24 which is also off-set rear-.. .
wardly from the centerline of the knitting machine.
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` 1~37273 ` The fabric take-down structure, generally designated 26 and shown in detail in Figures 2-6, is supported by the upright frame members 28 and 30 and rotates on track 32 in synchronism with the rotation of the needle cylinder 14 via :~
5 wheels 34 rotably connected to the frame members 28 and 30.The oxbow shaped rod 16 is suspended for vertical ~ ;
movement by arms 36 which are pivotally secured to lever ~-arms 38, 39, 40 and 41, pivotally mounted to the frame ~ -. members 28 and 30 substantially parallel to one another. To `` 10 bias the rod 16 in the downward position another lever arm : 42 is fixed to each of the arms 36 and has a spring member ~ 44 connected thereto with the other end of the spring being .~.; connected to each of the frame members 28 and 30.
As described briefly above, the rod 16 is oxbow shaped and is located between the needle cylinder 14 and the ,: .
. take-down rolls 18 and 20 so that the fabric F passes under the rod 16 as it passes to the take-down rolls 18 and 20. For the most efficient operation of the machine it is desired to - `
~i; maintain the`tension between needle cylinder 14 and the ` 20 take-down rolls 18 and 20 substantially the same across the . width of the fabric F. Since the fabric length adjacent the ... - center of the fabric F is longer than the fabric length adjacent the ends of the fabric when the cylinder of knit fabric at the cylinder needles 14 is spread and flattened under the same thec~retical tension, it is necessary to decrease the ~: :
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-~1037Z73 length of travel of the center of the flattened fabric F between the needle cylinder 14 and the take-down rolls 18 and 20 relative to the path of travel of the flattened fabric outward of the center of the fabric to maintain a constant tension across the width of the fabric since the take~down rolls apply a substantially even pull across the width of the flattened fabric F. Therefore, the rod 16 is oxbow shaped to decrease the path of travel of the fabric at the center of the rod and increase the path of travel of the fabric slightly outward of the center of the fabric to compensate for the differential ; fabric lengths developed when the cylinder or tube of fabric is spread and flattened prlor to delivery to the take-down rolls 18 and 20. As noted briefly before, a secondary spreader bar 17 is located inside the flattened fabric tube F to control ~ - 15 the width of the tube. The secondary spreader bar 17 has a `~ ~ pair of wheels 82 and 84 pivotally mounted on each end thereof to roll inside the fabric as the fabric is drawn by the . ,~. .
take-down rolls 18 and 20. Bar 17 basically consists of two ; ~-~
, threaded po~tions 86 and 88 with a turnbuckle 90 mounted therebetween to vary the width of the fabric F. The spreader bar 17 is secured to the spreader bar 15 by means of cables 92 which pass under the oxbow shaped rod 16 inside the fabric.
As discu~sed briefly, the needle cylinder 14 and the take-down apparatus 26 are rotated in synchronism by a drive ` 25 means (not shown). The take-down rolls 18 and 20 and the ;.. :` ' ~'- .
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~037273 . surface drive roll 24 are driven by a separate variable speed drive motor 46 mounted on the knitting machine. The drive motor 46 drives both the roll 20 and 24 through a suitable drive belt 47 connected to the sprocket 48 operably associated with the shaft of the drive motor, the sprocket 50 on the shaft of take-down roll 20 and the sprocket 51 on the shaft of the . surface drive roll 24. To maintain nip pressure between rolls 18 and 20, tXe roll 18 is spring located by means of a spring 52 toward the roll 20 and can be adjusted by adjust-ment of the nut 54. When the nip pressure between the take-: ,.
: down rolls 18 and 20 has been adjusted the speeds of the take-down rolls 18 and 20 and the surface roll are automati-cally and simultaneously adjusted in accordance with the pull . down tension in the fabric F by the vertical position of the rod 16. The vertical position of the rod 16 through the arm ` 36 and the lever 41 controls the vertical position the rod 56 . connected to the lever 41 which in turn adjusts the speed of the variable speed motor 46.
As noted above, the take-down rolls 18 and 20 are Z0 off-set from the centerline of the machine toward the rear . thereof to allow the production of a larger roll 22. When - ~ producing such a roll it is necessary to provide a means to ~ :
readily doff same, especially when using female knitting ~: machine operators. To this end the doffing mechanism cons-isting of a pair of lever arms 58, a pair of bell cranks : ', ` ` ~037Z73 60, and a doffing handle mechanism 62 is employed. The doffing mechanism basically consists of a doffing handle 64 connected to a pair of elongated lever arms 66 each of which has a groove 68 therein facing toward the take-up roll 2Z.
- 5 Each of the lever arms 58 is pivotally connected to one of the lever arms 66 at 70 and to the inner wall of the respective , frame member 28 or 30 at 71. Each of the bell cranks 60 is also pivotally connected to one of the elongated lever arms 66 at 72 and to the inner wall of the respective frame member 28 ; 10 or 30 at 74. Rigidly secured to each of the elongated lever arms 66 is a bracket member 67 which has a roll support rod - 69 therebetween.
Looking now primarily to Figures 4 and 5 the doffing operation will be explained. As is well known the take-up `~
roll winds up the fabric F on a tube 76 in which is inserted a , core 78. As shown in Figures 4 and 5 the core 78 is slidably , mounted in the groove 68 so that as the roll grows in diameter the core and tube will move upwardly. When the desired diameter rol~ is wound the doff handle 64 is grasped and moved in a counterclockwise direction to unroll the roll 22 somewhat to provide a fabric tail and to rotate the support 69 -~ - ~
, counterclockwise into engagement with the roll 22 to aid in ~ ;
causing the roll to be lowered onto the buggy 80. The core is guided by the links 58 and 60 to raise the center approximately Z5 4" before the roll is lowered toward the buggy 80. As the ' ' ~: .
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handle is being rotated to a horizontal position it is pulled to the left (Figures 4 and 5) to aid in depositing the roll Z2 on the buggy 80. Then the doff handle is pushed to the right until the core 78 drops out of the groove 68 to disengage the roll 22.
; 5 The core 78 is then disengaged from the tube 76, the fabric cut and the buggy moved to a remote position. Then the doffing mechanism is in position to be loaded with a new tube and be threaded up with more fabric.
It is obvious that an improved circular knitting machine has been provided that can roll up large rolls of knit fabric and which at the same time can be readily doffed with -- a minimum of effort.
Although the preferred embodiment of the invention has been described, it is contemplated that many changes may be made without departing from the scope or spirit of the invention and it is desired that the scope of the invention be limited only by the claims.
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` 1~37273 ` The fabric take-down structure, generally designated 26 and shown in detail in Figures 2-6, is supported by the upright frame members 28 and 30 and rotates on track 32 in synchronism with the rotation of the needle cylinder 14 via :~
5 wheels 34 rotably connected to the frame members 28 and 30.The oxbow shaped rod 16 is suspended for vertical ~ ;
movement by arms 36 which are pivotally secured to lever ~-arms 38, 39, 40 and 41, pivotally mounted to the frame ~ -. members 28 and 30 substantially parallel to one another. To `` 10 bias the rod 16 in the downward position another lever arm : 42 is fixed to each of the arms 36 and has a spring member ~ 44 connected thereto with the other end of the spring being .~.; connected to each of the frame members 28 and 30.
As described briefly above, the rod 16 is oxbow shaped and is located between the needle cylinder 14 and the ,: .
. take-down rolls 18 and 20 so that the fabric F passes under the rod 16 as it passes to the take-down rolls 18 and 20. For the most efficient operation of the machine it is desired to - `
~i; maintain the`tension between needle cylinder 14 and the ` 20 take-down rolls 18 and 20 substantially the same across the . width of the fabric F. Since the fabric length adjacent the ... - center of the fabric F is longer than the fabric length adjacent the ends of the fabric when the cylinder of knit fabric at the cylinder needles 14 is spread and flattened under the same thec~retical tension, it is necessary to decrease the ~: :
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-~1037Z73 length of travel of the center of the flattened fabric F between the needle cylinder 14 and the take-down rolls 18 and 20 relative to the path of travel of the flattened fabric outward of the center of the fabric to maintain a constant tension across the width of the fabric since the take~down rolls apply a substantially even pull across the width of the flattened fabric F. Therefore, the rod 16 is oxbow shaped to decrease the path of travel of the fabric at the center of the rod and increase the path of travel of the fabric slightly outward of the center of the fabric to compensate for the differential ; fabric lengths developed when the cylinder or tube of fabric is spread and flattened prlor to delivery to the take-down rolls 18 and 20. As noted briefly before, a secondary spreader bar 17 is located inside the flattened fabric tube F to control ~ - 15 the width of the tube. The secondary spreader bar 17 has a `~ ~ pair of wheels 82 and 84 pivotally mounted on each end thereof to roll inside the fabric as the fabric is drawn by the . ,~. .
take-down rolls 18 and 20. Bar 17 basically consists of two ; ~-~
, threaded po~tions 86 and 88 with a turnbuckle 90 mounted therebetween to vary the width of the fabric F. The spreader bar 17 is secured to the spreader bar 15 by means of cables 92 which pass under the oxbow shaped rod 16 inside the fabric.
As discu~sed briefly, the needle cylinder 14 and the take-down apparatus 26 are rotated in synchronism by a drive ` 25 means (not shown). The take-down rolls 18 and 20 and the ;.. :` ' ~'- .
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~037273 . surface drive roll 24 are driven by a separate variable speed drive motor 46 mounted on the knitting machine. The drive motor 46 drives both the roll 20 and 24 through a suitable drive belt 47 connected to the sprocket 48 operably associated with the shaft of the drive motor, the sprocket 50 on the shaft of take-down roll 20 and the sprocket 51 on the shaft of the . surface drive roll 24. To maintain nip pressure between rolls 18 and 20, tXe roll 18 is spring located by means of a spring 52 toward the roll 20 and can be adjusted by adjust-ment of the nut 54. When the nip pressure between the take-: ,.
: down rolls 18 and 20 has been adjusted the speeds of the take-down rolls 18 and 20 and the surface roll are automati-cally and simultaneously adjusted in accordance with the pull . down tension in the fabric F by the vertical position of the rod 16. The vertical position of the rod 16 through the arm ` 36 and the lever 41 controls the vertical position the rod 56 . connected to the lever 41 which in turn adjusts the speed of the variable speed motor 46.
As noted above, the take-down rolls 18 and 20 are Z0 off-set from the centerline of the machine toward the rear . thereof to allow the production of a larger roll 22. When - ~ producing such a roll it is necessary to provide a means to ~ :
readily doff same, especially when using female knitting ~: machine operators. To this end the doffing mechanism cons-isting of a pair of lever arms 58, a pair of bell cranks : ', ` ` ~037Z73 60, and a doffing handle mechanism 62 is employed. The doffing mechanism basically consists of a doffing handle 64 connected to a pair of elongated lever arms 66 each of which has a groove 68 therein facing toward the take-up roll 2Z.
- 5 Each of the lever arms 58 is pivotally connected to one of the lever arms 66 at 70 and to the inner wall of the respective , frame member 28 or 30 at 71. Each of the bell cranks 60 is also pivotally connected to one of the elongated lever arms 66 at 72 and to the inner wall of the respective frame member 28 ; 10 or 30 at 74. Rigidly secured to each of the elongated lever arms 66 is a bracket member 67 which has a roll support rod - 69 therebetween.
Looking now primarily to Figures 4 and 5 the doffing operation will be explained. As is well known the take-up `~
roll winds up the fabric F on a tube 76 in which is inserted a , core 78. As shown in Figures 4 and 5 the core 78 is slidably , mounted in the groove 68 so that as the roll grows in diameter the core and tube will move upwardly. When the desired diameter rol~ is wound the doff handle 64 is grasped and moved in a counterclockwise direction to unroll the roll 22 somewhat to provide a fabric tail and to rotate the support 69 -~ - ~
, counterclockwise into engagement with the roll 22 to aid in ~ ;
causing the roll to be lowered onto the buggy 80. The core is guided by the links 58 and 60 to raise the center approximately Z5 4" before the roll is lowered toward the buggy 80. As the ' ' ~: .
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handle is being rotated to a horizontal position it is pulled to the left (Figures 4 and 5) to aid in depositing the roll Z2 on the buggy 80. Then the doff handle is pushed to the right until the core 78 drops out of the groove 68 to disengage the roll 22.
; 5 The core 78 is then disengaged from the tube 76, the fabric cut and the buggy moved to a remote position. Then the doffing mechanism is in position to be loaded with a new tube and be threaded up with more fabric.
It is obvious that an improved circular knitting machine has been provided that can roll up large rolls of knit fabric and which at the same time can be readily doffed with -- a minimum of effort.
Although the preferred embodiment of the invention has been described, it is contemplated that many changes may be made without departing from the scope or spirit of the invention and it is desired that the scope of the invention be limited only by the claims.
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Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A circular knitting machine comprising: means to produce a knitted fabric, means to take up the knitted fabric produced and a semi-automatic means to mechanically doff the fabric from the means to take up the fabric, said semi-automatic means including a pair of spaced lever arms pivotally connected to said machine, a handle means extending between and connected to said lever arms, said lever arms each having a groove on the inside surface thereof with one side of said groove on each lever arm being longer than the other side of each groove, said means to take up the knitted fabric including a shaft adapted to be slidably mounted at each end in said grooves.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/540,268 US3985001A (en) | 1974-03-13 | 1975-01-10 | Take up and doffing apparatus for a circular knitting machine |
| CA231,189A CA1034396A (en) | 1975-01-10 | 1975-07-10 | Circular knitting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1037273A true CA1037273A (en) | 1978-08-29 |
Family
ID=25668022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA289,765A Expired CA1037273A (en) | 1975-01-10 | 1977-10-28 | Circular knitting machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1037273A (en) |
-
1977
- 1977-10-28 CA CA289,765A patent/CA1037273A/en not_active Expired
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