EP0043371A1 - Procede de commande de metiers a tricoter a barre droite - Google Patents

Procede de commande de metiers a tricoter a barre droite

Info

Publication number
EP0043371A1
EP0043371A1 EP19800901805 EP80901805A EP0043371A1 EP 0043371 A1 EP0043371 A1 EP 0043371A1 EP 19800901805 EP19800901805 EP 19800901805 EP 80901805 A EP80901805 A EP 80901805A EP 0043371 A1 EP0043371 A1 EP 0043371A1
Authority
EP
European Patent Office
Prior art keywords
action
unit
units
knitting
signals
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Withdrawn
Application number
EP19800901805
Other languages
German (de)
English (en)
Inventor
Barry Colin Strong
William Clayton
Thomas George Hesketh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
William Cotton Ltd
Original Assignee
William Cotton Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by William Cotton Ltd filed Critical William Cotton Ltd
Publication of EP0043371A1 publication Critical patent/EP0043371A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/94—Driving-gear not otherwise provided for
    • D04B15/99—Driving-gear not otherwise provided for electrically controlled
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B11/00—Straight-bar knitting machines with fixed needles

Definitions

  • the invention relates to methods for controlling straight bar knitting machines.
  • the multi-section machine undergoes a "turnaround sequence" to bring all mechanisms and components to the position for starting up.
  • the "turn-around” is effected by a clock-control which advances at a predetermined speed and actuates the appropriate mechanism and components in the desired sequence.
  • a method for controlling straight bar knitting machines comprising electronically interconnecting a plurality of mechanically separate straight bar knitting machine units, starting all the units in a preprogrammed manner, deriving an action-complete signal at least at the termination of knitting an article and arresting any units after an appropriate action complete signal to enable all units to start once more in that pre-programmed manner.
  • the units are started simultaneously although they could be phased to start one after the other in a predetermined sequence.
  • straight bar knitting machines can be arranged on a factory floor so as to make the best use of available space, maximuse access for repair and maintenance and enable additional units to be incorporated or removed having regard to production requirements.
  • the overall arrangement can provide the same output as large known multi-section arrangements (having say 6 or 12 knitting sections) without the attendant inflexibility and requirement for large floor areas.
  • the operative can still service the machines to remove finished articles etc. by hand or automatically.
  • each unit provides a plurality of action complete signals at vital stages of operation and a final one of said action complete signals being used for any arresting of the unit that may be necessary, the other of said action complete signals being used to detect any fault and arrest the unit until the fault is corrected.
  • mechanisms similar to those used for synchronous re-starting can be used to supervise operation of the units to obtain feed-back. Vital stages occur when a certain action must be completed to ensure continued safe operation of the knitting machine.
  • the final one of said action complete signals is given at the end of a turn around sequence for each unit to its starting condition, ready for knitting a first course.
  • An arrest signal could be given at an early stage of turn around as long as knitting has been completed and is not interrupted but machines may become dis-synchronised before re-starting during the remainder of the turn-around sequence.
  • a means is provided for electronically dis connecting a unit which fails to give a final action complete signal and for permitting the remaining units to proceed.
  • the number of sections per unit is kept small such as two in a back to back arrangement so that the production lost for repair and maintenance is small.
  • the action complete s ignal or signals are derived from a solid-state pressure sensitive device to reduce the number of moving parts and reduce cost.
  • the action to be detected is initiated electronically and the initiation of the action enab les the solid state pressure sensitive device so that spurious arrest signals are reduced.
  • a simple , yet reliable and easily controlled arrangement is provided by having the action complete signal or signals derived from a solid-state pressure sensitive device .
  • the microprocessor may be centralised or accommodated in individual units as set out in the claims .
  • Figure 1 shows a plan view of one form of a knitting installation controlled by the method of the invention
  • Figure 2 shows another form of knitting installation controlled by yet a further method according to the invention. Description Of example of invention
  • Each unit 2 has two knitting sections 4 arranged back to back as described in the West-German Offenlegungsschrift 2 , 900 , 876. There is a supply of compressed air, electricity etc.
  • Each unit incorporates a microprocessor for controlling the mechanical components of the unit and guards 8 for drive components .
  • the processor receives as inputs :
  • A a predetermined desired knitting program from memory , part of which cannot be altered as the steps concerned are essential for the satisfactory execution of a knitting operation , part of which may be variable at the behest of an operator to alter the size or shape or decorative patterning (if any) of a garment piece.
  • the program includes a succession of individual steps described in more detai l later on but known per se . Movement from some steps to subsequent steps is conditional upon : B signals from an action-sensing system which form a " read" part of the processor-mechanical component interface .
  • the action sensing system includes detectors for establishing that certain programmed steps have been completed or that the machine is in an appropriate mechanical condition for the next step to take place .
  • the timing of the execution of the program depends on a programmable " demand" speed of operation but the "true” timing may vary as a result of drag, inertia etc. Where the true timing has to govern operation the input signals B are utilised.
  • the process has as outputs: C instruction or GO signals for an electro pneumatic actuating system which through appropriate servo mechanisms initiate certain mechanical actions; D enabling signals forthose elements of the action sensing system necessary to monitor the progress of the programmed step just about to be executed.
  • the programm provides for the following main steps:
  • Hook up bar is set to start position. This is confirmed by pressure sensor which permits the next step;
  • Knit hook up courses 1. Knit hook up courses ;
  • the system incorporates solid-state pressure sensitive microswitches; light sensors; air flow sensors; sensor for detecting a particular shaft position. These components are essentially of the 0N-OFF type and do not signal any intermediate positions.
  • a vital part of the system is a cam shaft angle transducer on the main cam shaft which provides a continuous series of signals indicative of the cam shaft angle to synchronise the actuation of a certain component with a particular overall machine condition.
  • the program also provides a signal for controlling the machine speeds.
  • the true speed may however differ from the speed demanded by the program.
  • the timing of many operations is hence determined by reference to the main cam shaft angle which hence determines the absolute time at which a particular event occurs.
  • the cumulative time for executing the programm can vary from machine to machine as a result of differences in the true speed without interfering with the synchronisation of operations on a particular machine.
  • the electro-pneumatic system contains pneumatic pistons for operating props for levers, latches. bluffs, mechanical dog clutches, shogging forks on rods and also pneumatic clutches, auxiliary motors such as motors of the "pancake" type and re-set motors.
  • the program initiates the operation of the valves etc in response to the cam shaft angle transudcer, controlling the various actuation-system components just ahead of the actual desired stage of the cycle at which a change is desired so that by the time device i.e. ram has responded, the prop, bluff or truck is operated at the right time.
  • the microprecessor then awaits a signal from a component of the action sensing system such as a pressure sensitive device and only permits continued knitting if the action complete signal is delivered at the appropriate time.
  • the knitting of a garment piece with rib cuff etc may take for example 6 minutes.
  • Each of.the units operates at a slightly different speed depending on friction, tolerances etc so that, if machines were started simultaneously the final "turnaround complete" signal from the different units might be out of phase by as much as 30 seconds. This difference would increase if the different units were to restart without any synchronisation.
  • the microprocessors of the different machines are connected by lines 6 and contain a counter which records the "turnaround complete” signal of the unit interconnected by the lines 6.
  • the counter causes the drives (under guard 8 in Figure 1) to be arrested after the "turnaround complete” signal until the counter counts eight such signals. At that time the counter causes the microprocessor to initiate the knitting of a subsequent article.
  • Individual counters may be re-set to enable the number of machines connected by lines 6 to be reduced to take a machine out of action for maintenance.
  • the installation thus functions in a manner equivalent to a 16 section straight bar knitting machine as far as an operator is concerned with knitting starting and ending at approximately the same time .
  • An operative can thus control a number of such installations in the s ame way as he used to control a number of multisection straight bar knitting machines going from one to the other to check the individual sections .
  • the last sensor to operate during the turnaround sequence is arranged to cause the associated microprocessor to issue an internal " CLEAR TO RUN" signal for that unit and als o an external

Abstract

Un procede de commande de metiers a tricoter a barre droite consiste a connecter electroniquement entre eux une pluralite de metiers a tricoter a barre droite separes mecaniquement (2). Les metiers produisent un signal "action terminee" indiquant la fin d'un cycle. Le signal "action terminee" est utilise pour s'assurer que les machines redemarrent a chaque fois suivant le mode programme a l'avance bien que les temps des cycles individuels puissent etre differents. De preference, les metiers possedent des commandes a microprocesseurs disposees de maniere analogue et le signal "action terminee" de chaque metier donne lieu a la presence d'un signal interne "pret a fonctionner" et a l'absence d'un signal externe "inhibition" empechant le demarrage d'un metier adjacent, le dispositif etant concu de maniere telle que le demarrage des metiers ne peut avoir lieu que lorsque tous les signaux "inhibition" sont absents.
EP19800901805 1979-10-01 1980-09-30 Procede de commande de metiers a tricoter a barre droite Withdrawn EP0043371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7933903 1979-10-01
GB7933903 1979-10-01

Publications (1)

Publication Number Publication Date
EP0043371A1 true EP0043371A1 (fr) 1982-01-13

Family

ID=10508192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800901805 Withdrawn EP0043371A1 (fr) 1979-10-01 1980-09-30 Procede de commande de metiers a tricoter a barre droite

Country Status (3)

Country Link
EP (1) EP0043371A1 (fr)
JP (1) JPS56501250A (fr)
WO (1) WO1981000870A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078550B1 (fr) * 1981-11-04 1985-08-07 Aktiebolaget Iro Groupe de fournisseurs de fil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS165295B1 (fr) * 1973-07-12 1975-12-22
US4031718A (en) * 1973-08-10 1977-06-28 Macchine Tessili Circolari Matec S.P.A. Of Roma Electronic system for centrally controlling a plurality of knitting machines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8100870A1 *

Also Published As

Publication number Publication date
JPS56501250A (fr) 1981-09-03
WO1981000870A1 (fr) 1981-04-02

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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

17P Request for examination filed

Effective date: 19810928

AK Designated contracting states

Designated state(s): CH DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19831017

RIN1 Information on inventor provided before grant (corrected)

Inventor name: STRONG, BARRY COLIN

Inventor name: CLAYTON, WILLIAM

Inventor name: HESKETH, THOMAS GEORGE