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US3680331A - Synchronized program control apparatus for a knitting machine - Google Patents

Synchronized program control apparatus for a knitting machine Download PDF

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Publication number
US3680331A
US3680331A US4605A US3680331DA US3680331A US 3680331 A US3680331 A US 3680331A US 4605 A US4605 A US 4605A US 3680331D A US3680331D A US 3680331DA US 3680331 A US3680331 A US 3680331A
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United States
Prior art keywords
record carrier
elements
series
knitting machine
rotary part
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Expired - Lifetime
Application number
US4605A
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English (en)
Inventor
Franz Morat
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Franz Morat GmbH
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Franz Morat GmbH
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    • 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
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/12—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using record carriers
    • G05B19/124—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using record carriers using tapes, cards or discs with optically sensed marks or codes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25475—Sequence synchronized with machine axis, like knitting machine

Definitions

  • Another object of the invention is to provide the possibility of placing electronic program control means of several knitting machines, in a separate room.
  • Another object of the invention is to provide an apparatus by which the transporting means of the record carrier are. gradually accelerated to the required speed, synchronized with the rotation of the knitting machine at the synchronized speed, and then gradually decelerated to a standstill so that further operations of the knitting machine can be carried out under the control of a standard program.
  • the record carrier is transported by a stepping motor, or under the control of a stepping motor, which is electrically connected with, and controlled by, an impulse generator producing synchronizing pulses under the control of synchronizing elements on the rotary part of the knitting machine, for example by needles, or axially extending exactly uniformly spaced ridges, channels, or slots.
  • the apparatus of the invention has not only the advantage that the program control means can be separated from the knitting machine, and connected with the same only by a cable,
  • a substantial difficulty during the shifting from a standard program to the electronic selection in accordance with a pattern, and from pattern knitting to the standard program resides in that the starting and stopping of the transporting means of the record carrier tape has to take place at particular needle cylinder so that the transition between the operation under the control of the standard program, and under the control of the record carrier tape, takes place in a particular predetermined position of the needle cylinder. Due-to the great mass of the transporting means of the record carrier in accordance with the prior art, the stopping and also the accelerating of the same to the desired speed, cannot be carried out within the available time of less than 1 msec. so that due to overrunning of the record carrier upon stopping of the same, and also due to slow acceleration of the same to the desired predetermined speed, pattern errors are produced.
  • the apparatus has means by which the sensing of the record carrier can be interrupted at a predetermined point related to the angular position of the needle cylinder, and then started again at the full operational speed.
  • the apparatus comprises at least one impulse generator electrically connected with a stepping motor, and transmitting to the same pulses at a gradually reduced frequency in order to stop the record carrier, and at a gradually increased frequency for accelerating the record carrier, and at a constant frequency for maintaining the speed of the record carrier in synchronism with the needle cylinder.
  • the needle cylinder has three series of impulse creating elements each of which is associated with an impulse generator.
  • the stepping motor preferably drives a transporting roller engaging a record carrier tape and transporting the same past sensing means, such as a photocell.
  • the knitting machine has 24, 36 or 48 knitting stations, at which electromagnetic actuating means 5 are provided for effecting selection of needles in accordance with a desired pattern, as described, for example, in U.S. Pat. No. 3,449,928. For simplicitys sake, only one electromagnetic actuating means is illustrated, although the number of the same corresponds to the number of knitting stations. Depending on whether the respective electromagnetic actuating means are energized or de-energized when a needle passes the same, the respective needle is selected for a knittingoperation, or guided to an inoperative track of the cam box, not shown.
  • a record carrier tape 7 is guided over a pair of rollers, one of which is a transporting roller 9.
  • the record carrier 7 may be a photographic film on which recordings representing selecting operations are provided in the form of transparent or opaque points, in which event the sensing means 11 is photoelectric sensing means including one or several photocells onto which rays emitted by a source of light 13 are focussed so that a photocell generates command pulses in accordance with the arrangement of transparent or opaque points on the record carrier tape 7.
  • the command pulses or signals are transmitted through a multiple cable 15 to a connector-and switching means 17 in which they are connected, preferably over amplifiers, to conductors 19 which are respectively connected with differentelectromagnetic actuating means 5. It is also possible to provide a record carrier which is stationary, while the sensing means are transported along the same. i
  • the record carrier tape 7 has as many tracks in its longitudinal transporting direction as there are electromagnetic actuating means 5 provided around the periphery of the needle cylinder 1.
  • Each track consists of transparent and opaque. points.
  • the number of photocells of the sensing means 11 corresponds to the number of tracks, so that each photocell can be directly connected by a separate line in cable 15, and in cable 19 with the respective electromagnetic actuating means 5.
  • An amplifier may be provided in each line.
  • auxiliary photocells are provided which control means for compensating phase displacements and fluctuation of the light intensity of the source 13. Circuits serving this purpose are described in'the U.S. Pat. No. 3,449,928, and are not anobject of the present invention.
  • the speed at which the record carrier 7 passes the sensing means 11, or at which the sensing means 11 passes the stationary record carrier 7, is in a predetermined specific ratio with the number of revolutions of needle cylinder 1.
  • This ratio must be selected so that the sensing means 11 always senses a recording in a line of the record carrier transverse to the track in transporting direction, when a cylinder needle 3 passes an electromagnetic actuating means 5.
  • the time period during which two consecutive recordings of the record-carrier 7 pass the sensing means 11 must exactly be the same as the time period during which two adjacent cylinder needles 3 pass an electromagnetic actuating means 5, since only then the movement of the record carrier 7 is accurately synchronized with therotational speed of the needle cylinder 1.
  • the transporting roller 9 is driven by a stepping motor2l, and if necessary, a transmission may be provided between stepping motor 21 and, transporting roller 9.
  • the stepping motor 21 is connected by conductors 25, the connector and switching means 17, and a conductor 27 with an impulse generator 29 which is mounted on the cam box, not shown, in the proximity of the periphery of needle cylinder 1, and which responds to the passage of needle channels, or ridges forming the same to generate a synchronizing pulse when each needle 3 passes impulse generator 29.
  • the synchronizing pulse may be shaped to have a rectangular form by suitable well-known pulse shaping means, which are advantageously provided in the connecting and switching means 17.
  • Record carrier 7 is consequently transported one step in exact synchronism with the rotation of the needle cylinder when a cylinder needle 3 passes the impulse generator 29.
  • One step of record carrier 7 corresponds to the distance between two recordings thereon in transporting direction.
  • Impulse generators which can perform the function of impulse generator 29, and the associated amplifying and pulse shaping devices are well known, and consequently not described in detail, but attention is directed to U.S. Pat. Nos. 3,449,928, 3,327,499, and 3,313,128. Which specific type of impulse generator is used, depends on the operational conditions. It is, however, of importance that the frequency of the generated synchronizing pulses is directly proportionate to the rotary speed of the needle cylinder 1, since otherwise it is not possible to obtain exact synchronization between the rotation of the needle cylinder, and the movement of the record carrier 7.
  • the synchronizing pulses generated by impulse generator 29, and the sequential steps of stepping motor 21, are schematically illustrated in the lower portion of FIG. 3 which, however, is mainly concerned with the embodiment of FIG. 2.
  • FIG. 2 which illustrates a preferred embodiment of the invention
  • corresponding parts in FIGS. 1 and 2 are indicated by the same reference numerals.
  • the embodiment of FIG. 2 has the advantage that it is possible to switch from a standard program knitting, for example, a plain fabric section, to the electronic control of the actuating and selecting means of the knitting machine in accordance with the pattern presented by the recordings on the record carrier 7.
  • the needle cylinder 1 is provided with the synchronizing impulse generator 29 which senses the needles, needle channels, or ridges separating the needle channels and produces corresponding synchronizing pulses. Axially spaced from impulse generator 29, and on opposite sides of the same, two additional impulse generators 31 and 33 are provided.
  • the impulse generators may be electromagnetic impulse generators, as disclosed in U.S. Pat. No. 3,449,928, or photoelectric impulse generators cooperating with a source arranged within the needle cylinder and projecting rays through slots 35 and '37 into the respective impulse generators 31 and 33. The arrangement may cor-, respond to the impulse generator disclosed in the U.S. Pat. No. 3,313,128.
  • impulse generator 31 is actuated by elements 35
  • impulse generator 29 is actuated by elements 34
  • impulse generator 33 is actuated by elements 37.
  • Elements 35 and 37 are arranged along an arc of 180 of the needle cylinder 1.
  • An existant needle cylinder 1 may be adapted in accordance with the embodiment of FIG. 2 by placing steel rings 38 and 40, respectively provided with elements 35 and 37, about the periphery of the needle cylinder 1.
  • a shifting drum 39 which has a peripheral cut-out engaged by a lug 41 on a disc 43 which is connected with needle cylinder 1 for rotation in direction of the arrow P.
  • the number of steps which shifting drum 39 turns during each revolution of needle cylinder 1 depends on the number of cut-outs in the drum 39, and on the number of lugs 41 on cam 43, and depends on the specific operational conditions. In the illustrated embodiment, shifting drum makes one step for each revolution of needle cylinder 1.
  • Shifting drum 39 carries shifting lugs 45 and 47 which cooperate with switches 49 and 51, respectively.
  • Switch 49 is connected with impulse generator 31, and switch 51 is connected with impulse generator 33.
  • Needle cylinder 1 carries axially aligned control lugs 53 and 55 which respectively cooperate with switches 57 and 59 mounted on the cam box, not shown, in axially aligned positions and in the planes of control lugs 53 and 55, respectively.
  • Switch 57 is connected with impulse generator 29, while switch 59 is connected with the connector and switching means 17 in such a manner that stepping motor 21 is shifted by control lug 55 from impulse generator 33 to impulse generator 31 when switch 59 is operated by control lug 55.
  • the impulse creating elements 35 and 37 are spaced from each other varying distances.
  • the series of impulse creating elements 35 are spaced from each other distances which decrease in the direction of rotation P of the needle cylinder, so that the frequency of the control pulses generated by impulse generator 31 increases when the first pulse is created by impulse creating element 35a, and the last pulse is created by the impulse creating element 35b.
  • the impulse elements 37 are spaced from each other gradually increasing distances in direction of rotation P of needle cylinder 1 so that the frequency of the control pulses generated by impulse generator 33 is gradually reduced when the first control impulse is created by element 370 and the last control pulse is created by element 37b.
  • the pulse creating elements 34, which control the impulse generator 29, are spaced from each other uniform distances so that impulse generator 29 generates control pulses at a constant frequency as long as needle cylinder 1 rotates at constant rotary speed.
  • the arrangement may be such that the distance of two elements 35, starting with element 35b, is equal to the distance between two needles or ridges 34 of needle cylinder 1, and then becomes greater until the distance between the penultimate element 37 and the last element 37b is a multiple of the distance between the needles or elements 34.
  • the two series of pulse creating elements 35 and 37 extend over half the periphery of needle cylinder 1, which is not absolutely necessary, but depends only on whether half a revolution, or less or more, or several cylinder revolutions are necessary to stop the record carrier completely, or to accelerate the same from standstill to a predetermined selected speed, as will now be explained.
  • FIG. 3 illustrates in the line associated with switch 49, an impulse which causes connection of stepping motor with impulse generator 31. After this impulse, impulse generator 31 generates impulses at a gradually decreasing distances at increasing frequency.
  • control lug 53 is located, axially aligned with the same.
  • switch 57 is actuated by control lug 53 so that stepping motor 21 is switched from impulse generator 31 to synchronizing impulse generator 29.
  • FIG. 3 also shows the switching impulse produced by switch 57, preceding the series of synchronizing pulses generated by impulse generator 29.
  • FIG. 3 illustrates n revolutions during which the record carrier 7 controls the selecting operations of the needles.
  • control lug 55 is also disposed, substantially axially aligned with the same.
  • switch 59 is operated, which disconnects the voltage from stepping motor 21, so that the same stops in an exactly determined position.
  • switch 59 disconnects impulse generator 33 from stepping motor 21, and connects impulse generator 31 to the same so that at the next operation of switch 49, pulses generated by impulse generator 31 are transmitted to the stepping motor 21.
  • the above-described arrangement has the effect that the record carrier 7, when it is to be stopped, does not have to be braked during a turning of the needle cylinder for a distance corresponding to the spacing between two needles, and that a large part of the periphery of the needle cylinder, for example are available for braking the record carrier, corresponding to 840 needle distances, if the respective decelerating elements 37 extend over 180.
  • the speed of the record carrier is so small that the same stops after the next step at an exactly defined point of the needle cylinder, namely where control lug 55 is located.
  • empty sections are provided between two sections in which recordings in accordance with a desired pattern are provided.
  • the empty sections have to be only so long in the transporting direction of the record carrier, as is needed bythe record carrier to decelerate from its normal operational speed to a complete stop,.and to accelerate from a complete stop again to the normal operational speed.
  • sensing means 11 may be disconnected during accelerating, decelerating and stopping of the record carrier 7. In this case, not only selected needles, but all needles may be used for making a plain fabric.
  • a standard program for a different fabric pattern can be stored in storage device 30 which is connected into the circuit by connector and switching means 17 when sensing means 11 is disconnected. The OR-circuit 22 and conductor 20 then supply command pulses from storage device 30 to the electromagnetic actuating means 5.
  • recording lines being in transverse position to the direction of movement of the record carrier.
  • Another advantage of the invention resides in that the drive means of the record carrier 7 are not mechanically connected to the needle cylinder 1.
  • the invention is not limited to circular knitting machines having only a set of cylinder needles, but may be applied to circular knitting machines having in addition to the cylinder needles, also dial needles and a dial for the same.
  • FIG. 2 is based on the fact that for generating the normal synchronizing pulses by impulse generator 29, and for accelerating and decelerating the record carrier 7, different impulse generators 31 and 33 are used.
  • accelerating elements 35 and decelerating elements 37 are disposed on the same circular line of the needle cylinder, which requires a somewhat different arrangement of a the lugs 45,47,53,55.
  • only one additional impulse generator has to be used in addition to the synchronizing impulse generator 29, and senses the accelerating and decelerating elements.
  • a photoelectric impulse generator as described in the US. Pat. No. 3,313,128, may be advantageously used in such an arrangement and cooperate with two rows of impulse creating elements whose distances are constant, and, respectively,
  • Synchronized program control apparatus for a circular knitting machine having a rotary part, comprising, in combination, means for supporting a record car rier for movement in one direction, said record carrier having recordings spaced in said one direction and representing operations of the knitting machine; sensing means for sensing the recordings of the record carrier and generating command pulses; electric actuating means for controlling said operations of the knitting machine and being controlled by said command pulses of said.
  • sensing means ;-a first series of acceleratingelements on said rotary part spaced from each other gradually decreasing distances in the direction of rotation, .a second series of synchronizing elements on said rotary part spaced from each other equal distances in the direction of rotation, and a third series of decelerating elements on said rotary part spaced from each other gradually increasing distances in the direction of rotation of the same; impulse generator means controlled by said elements to generate control pulses at corresponding frequencies, stepping motor means for stepwise transporting the record carrier in said one direction, and being controlled by said control pulses so that the record carrier means is first accelerated to a predetermined speed, then moves at said speed in exact synchronism with the rotation of said rotary part, and is then decelerated to a standstill; and switching means controlled by said rotary part to render said sensing means operative only when said second series of synchronizing elements controls said impulse generator means.
  • said rotary part is a needle cylinder; wherein said first, second, and third series arev spaced from each other in axial direction of said needle cylinder; and wherein said impulse generator means include three impulse generators controlled by said three series, respectively.
  • each of said first and third series of elements extend along an arc of n 4.
  • Apparatus as claimed in claim 3 wherein said arcs extend along the same half of the periphery of said needle cylinder.
  • Synchronized program control apparatus for a circular knitting machine having a movable part, comprising, in combination, means for supporting a record carrier for movement in one direction, said record carrier having recordings spaced in said one direction and representing operations of the knitting machine; sensing means for sensing the recordings of the record carrier and generating command pulses; actuating means for controlling said operations of the knitting machine and being controlled by said command pulses of said sensing means; a series of synchronizing elements on said knitting machine; impulse generator means controlled by said synchronizing elements to generate control pulses in exact synchronism with the movement of said movable part; motor means for transporting the record carrier in said one direction, and
  • Apparatus as claimed in claim 6 comprising means for operating said actuating means independently of said sensing means for knitting in accordance with a standard program while said motor means is being accelerated, decelerated, and at a standstill.
  • Apparatus as claimed in claim 10 including three series of elements spaced'from each other in axial direction of said needle cylinder, one of said series being said series of synchronizing elements, and the other two series being accelerating and decelerating elements, respectively.
  • Apparatus as claimed in claim 12 wherein said impulse generator means include three impulse generators controlled by said three series of elements, respectively.
  • Apparatus as claimed'in claim 6 wherein said meansfor accelerating and decelerating include a series of accelerating. elements on said part of said knitting machine spaced from each other gradually decreasing distances in the direction of movement and a series of decelerating elements on said part of said knitting machine spaced from each other gradually inthe ame di tanc e a3 said synchronizi elements.
  • Sync ronize program contro apparatus for a circular knitting machine having a rotary part, comprising, in combination, means for supporting a record carrier for movement in one direction, said record carrier having recordings spaced in said one direction and representing operations of the knitting machine; sensing means for sensing the recordings of the record carrier and generating command pulses; electric actuating means for controlling said operations of the knitting machine and being controlled by said command pulses of said sensing means; a series of synchronizing elements on said rotary part; impulse generator means controlled by said synchronizing elements to generate control pulses in exact synchronism with the rotation of said rotary part; stepping motor means for stepwise transporting the record carrier in said one direction, and being controlled by said control pulses so that said record carriermoves and is read out by said sensing means, and so that said actuating means carry out said operations in exact synchronism with the rotation of said rotary part; and means controlled by said rotary part for temporarily stopping said stepping motor means and the record carrier and for rendering said sensing means temporarily inoperative at a pre

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Knitting Machines (AREA)
US4605A 1969-01-23 1970-01-21 Synchronized program control apparatus for a knitting machine Expired - Lifetime US3680331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1903299A DE1903299B2 (de) 1969-01-23 1969-01-23 Programmsteuereinrichtung an Rundstrickmaschinen

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US4605A Expired - Lifetime US3680331A (en) 1969-01-23 1970-01-21 Synchronized program control apparatus for a knitting machine

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US (1) US3680331A (es)
AT (1) AT318122B (es)
BE (1) BE744871A (es)
DE (1) DE1903299B2 (es)
ES (1) ES376112A1 (es)
FR (1) FR2030176A1 (es)
IL (2) IL33302A0 (es)
NL (1) NL7001005A (es)
SE (1) SE363133B (es)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835668A (en) * 1971-04-22 1974-09-17 Fouquet Werk Frauz & Planck Combined knitting feed and transfer feed circular knitting machine
US3896638A (en) * 1971-06-16 1975-07-29 Morat Gmbh Franz Programme control devices
US3955383A (en) * 1974-03-14 1976-05-11 Kabushiki Kaisha Toyota Chuo Kenkyusho Signal generator for circular pattern knitting machines
US3955384A (en) * 1974-03-14 1976-05-11 Kabushiki Kaisha Toyota Chuo Kenkyusho Needle selection control apparatus for circular pattern knitting machines
US3964276A (en) * 1975-09-03 1976-06-22 Okuma Machinery Works, Ltd. Knitting error detecting apparatus for circular knitting machine
US3975928A (en) * 1975-09-03 1976-08-24 Okuma Machinery Works, Ltd. Synchronizing signal detecting apparatus for circular knitting machines
US3995450A (en) * 1975-05-08 1976-12-07 The Singer Company Knitting machine performance regulating system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS604634B2 (ja) * 1974-04-09 1985-02-05 カネボウ株式会社 柄解折装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263453A (en) * 1962-12-06 1966-08-02 Kirkland & Company Ltd A Circular knitting machines
US3327499A (en) * 1964-07-06 1967-06-27 Morat Gmbh Franz Intermittently driven thread transporting apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263453A (en) * 1962-12-06 1966-08-02 Kirkland & Company Ltd A Circular knitting machines
US3327499A (en) * 1964-07-06 1967-06-27 Morat Gmbh Franz Intermittently driven thread transporting apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835668A (en) * 1971-04-22 1974-09-17 Fouquet Werk Frauz & Planck Combined knitting feed and transfer feed circular knitting machine
US3896638A (en) * 1971-06-16 1975-07-29 Morat Gmbh Franz Programme control devices
US3955383A (en) * 1974-03-14 1976-05-11 Kabushiki Kaisha Toyota Chuo Kenkyusho Signal generator for circular pattern knitting machines
US3955384A (en) * 1974-03-14 1976-05-11 Kabushiki Kaisha Toyota Chuo Kenkyusho Needle selection control apparatus for circular pattern knitting machines
US3995450A (en) * 1975-05-08 1976-12-07 The Singer Company Knitting machine performance regulating system
US3964276A (en) * 1975-09-03 1976-06-22 Okuma Machinery Works, Ltd. Knitting error detecting apparatus for circular knitting machine
US3975928A (en) * 1975-09-03 1976-08-24 Okuma Machinery Works, Ltd. Synchronizing signal detecting apparatus for circular knitting machines

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Publication number Publication date
SE363133B (es) 1974-01-07
FR2030176A1 (es) 1970-10-30
NL7001005A (es) 1970-07-27
IL33302A0 (en) 1970-01-29
ES376112A1 (es) 1972-09-01
IL33748A (en) 1973-11-28
DE1903299A1 (de) 1970-08-20
BE744871A (fr) 1970-07-23
DE1903299B2 (de) 1974-08-22
SU373960A3 (es) 1973-03-12
AT318122B (de) 1974-09-25

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