EP0452082A2 - Machine à tricoter rectiligne type cotton avec aiguilles fixes - Google Patents
Machine à tricoter rectiligne type cotton avec aiguilles fixes Download PDFInfo
- Publication number
- EP0452082A2 EP0452082A2 EP91303104A EP91303104A EP0452082A2 EP 0452082 A2 EP0452082 A2 EP 0452082A2 EP 91303104 A EP91303104 A EP 91303104A EP 91303104 A EP91303104 A EP 91303104A EP 0452082 A2 EP0452082 A2 EP 0452082A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- slurbar
- knitting machine
- motor
- straight bar
- machine according
- 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.)
- Withdrawn
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B11/00—Straight-bar knitting machines with fixed needles
- D04B11/02—Straight-bar knitting machines with fixed needles with one set of needles
Definitions
- This invention relates to straight bar knitting machines.
- a typical example of a straight bar knitting machine is produced by Bentley-Cotton Ltd and commonly referred to as a "Cottons Patented" machine.
- Straight bar knitting machines are provided with a plurality of carrier rods and a slurbar; each carrier rod carrying a yarn guide and the slurbar carrying a slurcock for each knitting section.
- the slurbar is reciprocated by a draw mechanism which includes a large draw cam and co-operating levers which is driven by the main camshaft of the knitting machine.
- the Slurbar in turn reciprocally drives the carrier rods in synchronism via a friction box mounted on the slurbar.
- the slurbar and carrier rods undergo one stroke of reciprocal motion and the displacement of the slurbar is greater than that of the carrier rods so that for each knitting section the slurcock trails behind a yarn guide.
- the differential in stroke of the slurbar and carrier rods is accommodated by the friction box.
- Adjustment of the stroke of the slurbar for narrowing and widening purposes is achieved by mechanically adjusting the operating levers driven by the draw cam so as to vary their effective displacement.
- a straight bar knitting machine including a slurbar reciprocally mounted in a frame of the machine and carrying a slurcock for each knitting section, an electronically controllable drive motor mounted on the frame, the drive motor being drivingly connected to the slurbar to cause reciprocal motion thereof, and control means operable on said motor for controlling the speed, direction and stroke displacement of the slurbar for each knitting cycle of the machine.
- the drive motor comprises an electric motor which may be a 5.5 kw, 3 phase 415 volts AC motor with an inverter drive, or similar DC stepper motor.
- the knitting machine includes a plurality of carrier rods and a drive motor is provided to drive directly the, or each, carrier rod and to drive the slurbar so that each rod and slurbar are independently driven.
- the or each drive motor preferably drives its respective rod or slurbar via a rack and pinion arrangement.
- the rack may be provided on the respective rod or slurbar and the pinion may be driven by the respective drive motor.
- the control means may comprise a computer, and may also comprise first position sensing means to sense the position of the or each rod and the slurbar whereby signals are transmitted from the first position sensing means to the computer such that the speed of the or each drive motor can be controlled.
- the control means may also comprise second position sensing means to sense the angular position of the camshaft of the knitting machine thereby to determine the stage in the knitting cycle of the knitting machine; whereby at selected positions in the knitting cycle the control means may activate a selected one or more of the, or each, drive motor thereby to drive a selected one or more of the, or each, rod and the slurbar.
- the knitting machine comprises a plurality of rods, preferably four, and a corresponding number of drive motors are provided for the rods and the slurbar.
- the machine comprises a plurality of rods, preferably four, and one drive motor to drive the slurbar, the rods being selectively driven by friction means which connects the slurbar to a selected one of the rods.
- FIG. 1 there is shown a typical draw mechanism 10 for a straight bar knitting machine.
- the draw mechanism 10 includes a draw cam 11 which is mounted on a shaft 12 driven from the main camshaft 14 at half the speed of the main camshaft 14.
- Cam followers 15 mounted on a horizontal link 16 cause a lever 17 to be reciprocated.
- the lever 17 is connected to a slide 18 which is fixedly secured to a slurbar assembly 20 including a slurbar 21 on which slurcocks (not shown in Figure 1) are mounted and carrier drive bar 22 on which a friction box 23 is mounted.
- the friction box 23 is selectively connectable with selected carrier rods 24. Accordingly reciprocation of the lever 17 causes reciprocal synchronised movement of the slurbar 21 and carrier rods 24.
- the drive linkage between the draw cam 11 and slurbar 21 differs from that shown although the principle of operation is basically the same.
- the friction box 23 is directly mounted on the slurbar 21. The present invention is intended to embrace these differing arrangements.
- the conventional draw mechanism 10 is dispensed with and replaced by an electronically controlled drive motor 30 which directly drives the slurbar assembly 20 for causing reciprocation of the slurbar assembly and the carrier rods 24.
- an electronically controlled drive motor 30 which directly drives the slurbar assembly 20 for causing reciprocation of the slurbar assembly and the carrier rods 24.
- FIG. 2 the slurbar 22 is shown having the friction box 23 mounted thereon. Reciprocation of the slurbar 22 is achieved by motor 30 driving a rack and pinion arrangement 31, the pinion 32 being driven by the motor 30 and the rack 33 being secured to the slurbar 22.
- the motor 30 drives the pinion 32 via a gearbox having no backlash. This enables the motor 30 to accelerate, decelerate and stop the slurbar in a positive manner with minimum play.
- the motor 30 is preferably an A/C motor which is driven via an invertor drive capable of delivering a relatively large amount if power at acceleration and deceleration.
- the arrangement is such that the slurbar is moved along a single stroke in about 0.2 seconds and that acceleration to a constant speed and deceleration is achieved in milliseconds. This means that for the majority of the stroke of the slurbar, the slurbar is displaced at a constant speed.
- a typical arrangement would be a 5.5K watt motor driven by a 11K watt A/C invertor.
- an electronic control system which operates the motor 30 to determine the direction, speed and distance travelled by the slurbar arrangement in order to synchronise the motion of the slurbar and carrier rods with the remaining components of the machine.
- main drive sensing means 58 are provided which indicate the rotational position of the main drive shaft.
- the disc 46 preferably has two protrusions 47 which are sensed by the proximity sensor 45; each protrusion 47 being located to indicate the position of the main camshaft 14 at the start of a knitting cycle.
- a pair of stops 50,51 are provided for engaging the friction box 23 to thereby arrest its motion on reciprocation of the slurbar 21 and thus define the limits of reciprocation of the carrier rods 24 driven thereby.
- a pair of sensors 60,61 are preferably provided on each stop 50,51 respectively.
- a first sensor 60 is provided to sense the presence of the friction box 23 as it approaches the associated stop 50,51 and produces a first signal which is sent to the control system.
- the control system responds to the first signal by initiating a deceleration of the motor 30. This has the effect of slowing the friction box 23 before impact with the stop and so reduces inertia forces on impact.
- the slurbar 21 continues its motion and the second sensor 61 senses the position of the slurbar after having travelled a predetermined distance beyond the stop position of the friction box.
- the second sensor 61 produces a second signal which is sent to the control system and is used thereby to stop the motor 30 and thus arrest the slurbar.
- the slurcocks are now in a trailing position behind the yarn feeders in readiness for the next knitting cycle.
- the overtravel of the slurbar beyond the limit of travel of the friction box 23 is not critical and typically is about 2.5 inches (62.5mm).
- the sensors 60,61 associated with each respective stop also indicate to the control system which limit of reciprocation the slurbar 21 has reached. This information is used to reverse the direction of the motor 30 for the next cycle. In addition this information is used to return the slurbar to the correct side of the knitting section in readiness for the commencement of a fresh knitting sequence.
- the sensors 60,61 are preferably proximity sensors and the slurbar 21 is provided with projection 66 at predetermined locations for co-operation with the proximity sensors 61.
- the adjustable stops 50,51 are provided for engagement with the carrier rods for defining their limits of reciprocal motion.
- the sensors 60,61 would be mounted on these stops with sensor 60 being arranged to determine the presence of a carrier rod as it approaches the associated stop and thereby produce the first signal.
- the second sensor 61 would still sense the position of the slurbar as before.
- An advantage of mounting the sensors 60,61 on the adjustable stops is that the arresting position of the slurbar is automatically adjusted when the stops are moved. Movement of the stops 50,51 is achieved in a conventional manner.
- this invention is particularly suitable as an adaptation of a conventional straight bar knitting machine, such as the knitting machines produced by Bentley Cotton Limited.
- a conventional straight bar knitting machine such as the knitting machines produced by Bentley Cotton Limited.
- An example of such a knitting machine is described in Knitting Technology - Second Edition by David J Spencer, publishes by Pergamon Press.
- FIG. 3 an alternative embodiment is illustrated showing a straight bar knitting machine having 4 carrier rods 24.
- the rods 24 carry yarn guides (not shown) to deliver yarn to the needles (not shown) of the knitting machine.
- Each rod 24 is driven with reciprocating motion as indicated by the arrow A by individual drive motors 12.
- Each drive motor 112 is connected to a pinion 112 a of a rack and pinion arrangement, the pinion 112 a being in meshing arrangement with a rack 112 b provided on each rod 24.
- a slurbar 14 which carries a slurcock 16 for moving sinkers (not shown) from a retracted position to a yarn engaging position.
- the slurbar 21 is also driven by the drive motor 30 in the manner described in the embodiment of Figure 2.
- the drive motors 30,112 can be, for example, an electric motor such as a 5.5 kw, 3 phase 415 volts AC motor with an inverter drive, or similar DC stepper motor.
- the motor should such that it is possible to control it accurately so that the yarn is delivered each time across the correct needles and so that the slurbar moves the slurcock accurately to the desired positions.
- the drive motors 30,112 are electronically controlled by a computer.
- the computer will determine when the drive motors 112 are switched on and off to drive or stop, as the case may be, the respective rods 2 or slurbar 14.
- Figure 4 shows a schematic diagram of a control system which can be used to control the drive motors 30,112.
- the control system comprises a pattern preparation system, an extended CRP 1.5 controller, position sensing means in the form of encoders and drive motors for the rods 24 and the slurbar 21.
- all four rods 24 can be used. However, for ordinary striping knitting operations, only one of the rods 24 need be used per course.
- the control means comprises first position sensing means to sense the position of the rods 24 and the slurbar 21.
- the position sensors may be in the form of an encoder driven by the motor for each rod 24 or slurbar 21 and transmit to the computer the positions of its respective rod 24 or slurbar 21.
- the computer can determine accurately the position of each rod 24 and the slurbar 21 whereby their motion during he knitting cycle can be accurately controlled.
- the computer can be programmed so that it activates a selected one of the drive motors 30,112 at first selected angular positions of the main camshaft.
- the selected drive motor 30,112 is activated, the rod 24 or slurbar 21 moves in reciprocating motion a desired number of cycles as monitored by the first position sensing means.
- the speed, acceleration and deceleration of the rod 24 or slurbar 21 can be monitored and adjusted to reduce stress on the yarn.
- the computer reverses the drive motor 112 to return the rod 24 or slurbar 12 to its original position.
- the invention has the advantage that the monitoring of the positions of the rod 24 and the slurbar 21 enables a check to be made to ensure that the rod 24 or slurbar 21 has completed a whole number of cycles and has returned to its original position at the same time as the computer deactivates the respective drive motor 112.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB909008156A GB9008156D0 (en) | 1990-04-10 | 1990-04-10 | A straight bar knitting machine |
| GB9008156 | 1990-04-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0452082A2 true EP0452082A2 (fr) | 1991-10-16 |
| EP0452082A3 EP0452082A3 (en) | 1992-03-25 |
Family
ID=10674238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19910303104 Withdrawn EP0452082A3 (en) | 1990-04-10 | 1991-04-09 | A straight bar knitting machine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0452082A3 (fr) |
| GB (1) | GB9008156D0 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3330150C2 (de) * | 1983-08-20 | 1995-01-19 | Scheller Gmbh | Flache Kulierwirkmaschine |
| DE3713341A1 (de) * | 1987-04-21 | 1988-11-10 | Scheller Gmbh Maschinenfabrik | Flachkulierwirkmaschine |
-
1990
- 1990-04-10 GB GB909008156A patent/GB9008156D0/en active Pending
-
1991
- 1991-04-09 EP EP19910303104 patent/EP0452082A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0452082A3 (en) | 1992-03-25 |
| GB9008156D0 (en) | 1990-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0867553B1 (fr) | Machine à tufter avec système d'entraînement de précision | |
| US4829917A (en) | Control system for hydraulic needle bar positioning apparatus for a tufting machine | |
| US5241842A (en) | Warp knitting machine with individually movable yarn guides arranged on a guide bar | |
| EP2765102B1 (fr) | Procédé de distribution de fil enroulé et dispositif pour sa mise en oeuvre | |
| GB2068149A (en) | Automatic thread handling system for a sewing machine | |
| US4445447A (en) | Tufting machine apparatus | |
| JP2022003188A (ja) | タフティング機用の移行機構 | |
| EP0708190B1 (fr) | Dispositif d'entraínement pour la transmission de mouvements horizontaux oscillatoires aux barres des guide-fils dans des métiers à tricoter | |
| CN1069936C (zh) | 控制涉及织针中心间的预定距离的导纱杆水平运动的方法 | |
| JPH11124759A (ja) | フォールプレートバーを有する経編機 | |
| US4587915A (en) | Method and sewing machine for approaching a predetermined end point of a seam | |
| EP1609900B1 (fr) | Métier à aiguilles avec changement automatique de trame | |
| EP0452082A2 (fr) | Machine à tricoter rectiligne type cotton avec aiguilles fixes | |
| EP0573121A1 (fr) | Procédé et appareil pour commander une machine de peignage | |
| CN1306108A (zh) | 经编机 | |
| US4895006A (en) | Crocheting machine | |
| GB2145120A (en) | Straight bar knitting machine (cotton system) | |
| US5410974A (en) | Embroidery machine with center drive | |
| WO1998026120A1 (fr) | Controleur des mouvements des composants tricotant d'un metier chaine, et procede correspondant | |
| US6920837B2 (en) | Sewing machine | |
| US4074641A (en) | Sewing machine | |
| KR20010074486A (ko) | 재봉 또는 자수 기계 | |
| US4332149A (en) | Needle bar adjustment mechanism for warp knitting machines | |
| NL8103725A (nl) | Grijperstangen- of grijperbandaandrijfinrichting van een weefmachine. | |
| JPH11513446A (ja) | たて編機等の編機 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19920926 |