IL33748A

IL33748A - Circular knitting machine

Info

Publication number: IL33748A
Application number: IL33748A
Authority: IL
Original assignee: Morat Gmbh Franz
Priority date: 1969-01-23
Filing date: 1970-01-20
Publication date: 1973-11-28
Also published as: SU373960A3; AT318122B; BE744871A; ES376112A1; DE1903299B2; SE363133B; FR2030176A1; US3680331A; DE1903299A1; NL7001005A; IL33302A0

Description

Circular knitting machine GmbH The relates to a circular knitting machine the type comprising one or more controllable a scanning device for scanning an information carrier and for converting information stored on the latter into electrical control signals which can be used to control the aforesaid a conveying driven in synchronism with the rotation of the needle to produce a relative movement between the information carrier and the scanning and a pulse synchronised with the rotation of the needle for the generation of timing In known circular knitting machines of this kind Patent the synchronization between the movement of the information carrier and the rotation the needle cylinder is obtained in that the conveyor roller of the informa carrier is by means of a shaft or by the same device which produces the rotation of the needle The phase displacements between the stroke of the information carrier and the stroke of needle cylinder unavoidably appear as result of play or slip in the case of shaft or are overcome in that the stroke impulses produced by the Impulse generator are superposed on the command Impulses produced by the information carrier in such a that a command delivered to the controlled mechanisms only when the stroke impulses coincide with the command the stroke of the information carrier and the stroke of the needle cylinder there is meant respectively the time interval in which two consecutive informations of the information are conveyed past the sensing device and two neighbouring cylinder needles are convoyed past a fixed The above described circular knitting machine works in a synchronous relation even at very high number of rotations of the needle which means that all the faults produced by play or slip are completely The information carrier may for a film a punched band a magnetic A disadvantage of the above described circular knitting machine on the one in the fact that the Information carrier as well as the circuitry needed for it actuation have to be always placed in the immediate vicinity of the because the mechanical coupling of the needle cylinder drive and of the information carrier conveyor device would not be possible on the other additional devices are required in order to obtain the These disadvantages avoided according to the present invention by mechanically coupling the conveying device of a circular knitting machine of the type referred to a motor which is adapted to provide a drive for said conveying device and which is connected electrically to the pulse The application of a drive in a circular knitting machine is known from Patent Specification which relates to a knitting machine wherein drives drive thread transporting means at speeds varying proportionate to any varied speed of the knitting The problems solved by using drives for driving thread transporting means are different from the problems solved by the present By according to the a step motor whose supply current is delivered by the 3troke impulse which for the webs of the needle cylinder located between the needle an electrical synchronization is Apart maintaining the normal working In a preferred embodiment there are provided at the needle cylinder three rows of impulse generating elements actuated each by an impulse the elements being evenly spaced in the direction of rotation in one ally increasingly spaced the second ro and gradually spaced in the third always in the direction of and programme controlled switches are provided for connecting the at to any of the three impulse The motor preferably actuates a conveyor roller which moves the information carrier past the sensing The invention is by way of in the accompanying drawings in 1 is a perspective view of the needle cylinder of a circular knitting machine and of the parts required selecting the the information 2 represents an improved embodiment of the which permits to stop or start the information carrier while the needle cylinder is is an impulse diagram and shows the impulses produced by the various devices of the embodiment of 1 shows only schematically the needle cylinder 1 of a circular knitting machine rotatable in the direction of the arrow since the remaining parts of the circular knitting machine are known and are not necessary for understanding the In the cylinder 1 the independently each up and downwardly movable cylinder needles are carrier as man longitudinally extending traces of transparent or opaque points as correspond to the number of electromagnets along circumference needle for or Each trace actuates separate electromagnet the sensing device has usually also a of so that each cell can be connected by means of special lead in the cable 15 directly with corresponding electromagnet The electronic system 17 contains in this case only the standardisation and amplifying In addition to traces the information may be provided marks bration of displacemen and variations in The circuits required for this purpose have been in Patent also included in the electronic system 1 The rate at which information carrier 7 is conveyed past the sensing device 11 or bust be in special relation with the number of rotations of the needle cylinder l and for so that the sensing device 11 scans a marking row passing perpendicular to the direction of movement of the exactly at the time at which cylinder needle passes in front of an electromagnet the frequency at which two longitudinal consecutive markings of the information carrier 7 are conveyed past the sensing device 11 must be equal to the frequency at which two secutive cylinder needles placed o the circumference of whieh the from a light source falls on the of the generators 33 Patent 3 313 The elements 35 37 may also be provided both above or beneath the needle webs on steel bands 40 attached needle needle cylinder 1 there is provided control which is rotated stepwise by a carrier The carrier attached to a disc 43 which rotates together 1 in the direction of the arrow steps by which the control drum rotated at each rotation of the cylinder varies for each specific embodiment according to 2 this number is At the control 39 there are provided control 47 which wit switches disposed the circumference the control drum The switch is impulse g enera or 31 and 51 with the generat 53 55 on The control cam 53 with a further 57 while the cam 55 with a further switch 57 generator 29 while switch 59 is connected with electric system 17 that whe the switch 59 is actuated by the control cam 5 the motor 21 is switched from the impulse generator 33 to the impulse between the needles or between the impulse produced by 57 also seen in By the arrangement described necessity of actuating carrier after the impulse immediately with number of s tops corresponding to the stroke number of the needle cylinder is the carrier first actuated slowly in correspondence with the arrangement of the elements until it the full speed as soon as the element is At the instant at which the stroke impulse generator 29 connected wit the 21 through switch the information carrier is conveyed synchronously with the needle At the same time the sensing device can be switched means of the switch For to the stroke impulse generator the knitting machine be actua by carrier 7 The number of these rotations is designated 3 by If a from the electronic control to the fixed programme the 45 of the control drum engages the so that the latter conveys whereby this latter is connected ith the motor 21 instead of stroke generator At the moment of over the element has just passed the impulse generator so that th next impulse of this impulse generator is by the element As a result the impulses generated A further advantage of the invention consists in the fact that the drive of the information carrier is not mechanically connected with the needle cylinder As a result a multitude of electronic instruments for the control of several simultaneously working circular knitting machines may disposed in a separate The whole tronic which is indicated in and 2 by electronic system 17 can be placed centrally on a single control The circular knitting machines are in this case connected with the control board by a multiple The invention is not limited to the arrangement of the elements 35 and of the switch 47 and 53 and 55 respectively and of the switches 51 and 59 shown in The arrangement of these parts on the needle cylinder may on the contrary be changed at will by the designer of Especially the elements 35 and 37 need not extend over half of the cylinder the invention is not limited to circular knitting machines but applies as well to round edge knitting and the cylinder machines in addition to the needle cylinder needle ribbed disc and ribbed The embodiment described in 2 is based on the assumption that for producing the standard stroke impulses generator and the impulse sequences for accelerating or braking the information carrier different impulse enerators have to be according to further the arrangement may such that the elements 35 37 are arranged sequence along the same line provided switch cams 47 are dis In this case only a single further impulse generator mus be used in addition to the stroke impulse generator an impulse generator as described in Patent may be which is operatively connected with two rows of impulse generating elements placed at equal distances and at increasing o decreasing distances respectively and according to the working phase of the knitting are insufficientOCRQuality

Claims

- 20 - k ' CLAIHS

1. A circular knitting machine comprising one or more electronically controllable devices, a sca ni g device for scanning an information carrier and for converting the information stored on the latter into electrical control signals which can be used to control the aforesaid device or devices, a conveying device, driven in synchronism with the rotation of the noodle cylinder, to produce a relative movement between the information carrier and the scanning device and a pulse generator, synchronized wit the rotation of the needle cylinder, for the generation of timing pulses, characterised in that the conveying device is coupled mechanically with a motor which is adapted to provide a step~by-step drive for said conveying device and which is connected electrically to the pulse generator.

2. A circular knitting machine as claimed in Claim 1, characterised in that a device is provided, by means of which the scanning of the information carrier can be interrupted, with the needle cylinder rotating, at a defined point relative to the said needle cylinder and can be resumed, after interruption, at the operating speed.

3. A circular knitting machine as claimed in Claim 2, characterised in that the said device comprises at least one pulse generator, which is connected to the step-by-step motor and feeds to the latter pulses of a gradually diminishing frequency to stop the conveying device, pulses with a gradually increasing frequency to accelerate the conveying device and timing pulses having a constant frequency to maintain the operating speed of the conveying device. 33748/2 21 -

4. A circular knitting machine as claimed in Claim 2, characterised in that there are provided on the needle cylinder three rows of pulse-generating elements, with which are associated respectively three pulse generators, one of said rows of elements consisting of elements that are uniformly spaced in the direction of rotation, the second row of elements consisting of elements having progressively increasing spacing in the direction of rotation and the third row of elements consisting of elements having progressively reduced spacing in the direction of rotation, and in that program-controlled switches for the selective switching-on of the step-by-step motor are provided on one of the three pulse generators.

5. A circular knitting machine as claimed in Claim 3 or 4, characterised in that electromagnetically operating pulse generators are provided for scanning either ridges on the circumference of the needle cylinder between the cylinder needles or corresponding elements secured at preselected intervals to the needle cylinder.

6. A circular knitting machine as claimed in Claim 3 or 4, characterised in that pulse generators are provided which work optically-electrically and scan slots or holes located at preselected spaced intervals in the needle cylinder.

7. A circular knitting machine as claimedjin Claim 4, characterised in that the pulse generator which generates the timing pulses works electromagnetically and the other two pulse generators work optically-electrically.

8. A circular knitting machine as claimed in Claim 6 or 7, characterised in that an extended part of the needle cylinder is formed with two rows of slots, one roi* of which consists of slots with a raduall increasin s acin and the Q 33748/2 - 22 - other row of which consists of slots with a gradually decreasing spacing.

9. A circular knitting machine as claimed in Claim 8, characterised in that each of the rows of slots extends over half the circumference of the needle cylinder.

10. A circular knitting machine as claimed in any one of Claims 1 to 9» characterised in that the said machine is designed as a circular rib knitting machine.

11. An electronically controllable circular knitting machine substantially as described with reference to the accompanying drawings.. For the Applicants RTNERS EHA :CB