US3735147A - Automatic restart circuit for knitting machines and the like - Google Patents

Automatic restart circuit for knitting machines and the like Download PDF

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Publication number
US3735147A
US3735147A US00260768A US3735147DA US3735147A US 3735147 A US3735147 A US 3735147A US 00260768 A US00260768 A US 00260768A US 3735147D A US3735147D A US 3735147DA US 3735147 A US3735147 A US 3735147A
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contacts
stop
relay
motor
motion device
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US00260768A
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A Kryszek
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions

Definitions

  • ABSTRACT A control circuit for a knitting machine interrupts machine operation in the event that yarn tension is improper as detected by plural stop-motion devices. After a predetermined time period, the machine is automatically restarted if proper tension conditions are restored, but if improper tension remains, the machine is semi-permanently disabled until service personnel can correct the improper conditions and restart the machine manually. A main control relay remains operative for a predetermined delay period after a tentative stop" for reinitiating machine operation at the end of such time under proper conditions.
  • Apparatus employing thread or yarn for the manufacture of knitted or woven articles may employ stopmotion devices for interrupting machine operation in the event improper thread or yarn tension is detected. Thus, undesired breaking of threads can be avoided be fore manufacture of an incomplete fabric is caused to occur. Similarly, the end of a roll or spool of thread or yarn is detected by the absence of proper tension. Improper tension for whatever cause generally brings about a semi-permanent interruption in machine operation so appropriate corrective action can be taken by service personnel, after which the machine is manually restarted.
  • a stop-motion device will make contact momentarily and totally stop the machine when such action may actually be undesired, for example, when an occasional irregularity in yarn trips the stop-motion device.
  • This false stopping causes unnecessary down time for machines and requires unnecessary attention of personnel to restart machines after false stops.
  • themachine be brought to a halt when the stop-motion device is tripped, just in case the tentative stop actually indicates improper tension, so that a faulty fabric will not be manufactured.
  • the apparatus is given time to regain the proper tension condition.
  • a multiplicity of quick repetitive starts and stops merely brought about in direct response to thread or yarn tension, are to be avoided from the standpoint of accurate manufacture of the end product and appropriate care of the machinery.
  • apparatus is interrupted in operation when incorrect tension is detected by a stop-motion device, and a timing cycle is initiated. If at the end of that timing cycle the correct tension has been restored, the machine is restarted for normal operation. However, if at the end of said period improper tension is still detected, the machine is semipermanently disabled, requiring a manual operation for restart, thus giving service personnel an opportunity to correct the undesired condition.
  • a control means remains energized after the apparatus is deenergized, indicating the machine has just been on, and a timing cycle is initiated. If at the end of such timing cycle the proper-tension condition has been restored, an automatic restart is initiated via said control means. If at the end of such timing cycle the improper tension remains, the aforesaid control means is disabled, whereby a manual restart will be required for reinitiating machine operation.
  • FIG. 1 is a partially broken away view of a knitting machine employing apparatus according to the present invention.
  • FIG. 2 is a schematic diagram of automatic restart circuitry according to the present invention.
  • a circular knitting machine is schematically illustrated.
  • Yarn 10 from bobbin 12 passes over arms 14 of a first stop-motion device generally indicated at 16. From there, the yarn extends to a second stop-motion device 18 through which the yarn passes before reaching latch needle 20.
  • Latch needle 20 is supported from a rotating assembly 22 driven by gear motor 24, and, as is well understood by those skilled in the art, the yarn 10 will be engaged by a multiplicity of latch needles during machine operation, only one being shown for simplicity of explanation. Furthermore, a further multiplicity of yarns 10 each withdrawn from its own bobbin and passing through separate stop-motion devices, will be disposed in circular fashion around the knitting machine.
  • Arms 14 of stop-motion device 16 are adapted to be drawn downwardly in response to yarn tension against a spring tension established in the stop-motion device, excessive yarn tension causing a connection to be made between upper rotating contact 26 and lower flat contact 28 as arms 14 rotate downwardly. Furthermore, slackness or a break in the yarn will be detected by upward movement of member 30, under the influence of counterweight 32, for alternatively causing connection between contacts 26 and 28 as contact 26 rotates in the opposite direction.
  • Contact 26 is cam-shaped, having a substantially flat lower face disposed in nonengagement with contact 28 when normal yarn tension occurs.
  • the yarn passes over weighted tension means 34 wherein weights may be disposed against the yarn over spindle 36, the yarn further passing through eyelets 38, 40 and 42.
  • Eyelet 40 is located at the end of pivotal member 44 springbiased to bring about connection of contacts 46 in the event of slackness in the yarn.
  • stop-motion devices 16 and 18 The purpose of the stop-motion devices 16 and 18 is the complete arrest of the knitting machine operation should the yarn become too tight, or break, or otherwise fail to be under the proper tension. It will be appreciated that a correction must be made before resuming knitting operation, in order to prevent the production of a faulty end product. A common example of the detection of improper tension takes place when a particular bobbin runs out of yarn.
  • a stop-motion device will make contact or trip momentarily and totally stop the knitting machine when such action may be undesired, for example when an occasional irregularity in the yarn passes through the stop-motion device.
  • This false stopping causes unnecessary down time for the knitting machines in a large plate and requires the services of someone to restart knitting machines manually after false stops. It is, however, desired that the machine be brought to a halt in the case of a tentative stop," giving the apparatus time to regain the proper tension condition, avoiding the breaking of yarn, and the like.
  • Three-phase motor 24 is connected to lines one, two and three via contacts A1, A2 and A3 of a conventional magnetic starter having an operating coil A.
  • the magnetic starter which may be of a conventional type, is referred to as a motor-energizing relay or merely a motor relay.
  • a control circuit is connected at terminals 1 and 2 to a source of control voltage and includes the operating coil A for the motor relay.
  • the control circuit further includes a start relay coil B having one terminal thereof coupled to terminal 1 through start pushbutton contacts 48 and stop pushbutton contacts 49 disposed serially in that order.
  • the remaining terminal of start relay coil B is coupled, via normally closed contacts D1 and E1, disposed serially in that order, to terminal 2.
  • Normally closed contacts E1 are operated by coil E connected across a pair of motor leads on the load side of a pair of motor relay contacts.
  • Normally closed contacts D1 are operated by the stop-motion devices as hereinafter described.
  • Start relay coil B is provided with contacts B1 connecting the terminal of the start relay coil on the start pushbutton side thereof to one terminal of a main control relay coil C, said terminal also being coupled to the junction between the start and stop pushbutton via holding contacts Cl associated with main control relay coil C.
  • the remaining terminal of the coil of main control relay C is returned to terminal 2 via the parallel combination of normally closed contacts D2, and normally closed contacts T2, the latter being in series with switch S1.
  • Contacts T2 are associated with a timer as hereinafter described.
  • Motor relay coil A has a first lead connected to the junction of the start and stop pushbuttons by way of main control relay contacts C2 and start relay contacts B2 disposed in series. Contacts B2 are shunted by holding contacts A4 associated with coil A, as well as by timer contacts T1. The remaining terminal of coil A is returned to terminal 2 via normally closed contacts F1 associated with the stop-motion devices as hereinafter indicated.
  • a timer operating coil T has one lead connected to the junction between contacts D1 and E1, and the other lead connected to the junction between contacts B1 and main control relay operating coil C.
  • This timer or timing relay is designed to operate its contacts, i.e., the closing of contacts T1 and the opening of contacts T2, after a predetermined time, e.g., after about two to four seconds.
  • First and second stop-motion relay coils, F and D are connected to a source of control voltage via the parallel combination of stop-motion device contacts 27 and 47. These correspond, in general, to the contacts of the stop-motion devices 16 and 18 illustrated in FIG. 1, but it will be understood that in a given apparatus, a large number of further stop-motion device contacts will be connected in parallel and are here exemplified by contacts 27 and 47. If any one of these stop-motion contacts close, operating coils D and F will be energized from a control voltage source.
  • Althougl'i contacts B2 are only closed as long as the start pushbotton is depressed, as soon as operating coil A is actuated, holding contacts A4 close in parallel with contacts B2 for maintaining operating coil A in actuated condition.
  • the apparatus may be manually stopped at any time by depressing the stop pushbutton for opening contacts 49.
  • switch S1 will be closed, placing contacts T2 in parallel with contacts D2.
  • Operating coil E is energized when the motor is energized, whereby normally closed contacts E1 have been opened. Now should improper tension occur, closing contacts of one of the stop-motion devices, relay operating coils F and D will be actuated, relay F opening normally closed contacts Fl.
  • Motor relay coil A is denergized resulting in stopping motor 24 when contacts A1, A2 and A3 open. Consequently, the apparatus will be stopped and knitting operations will cease.
  • operating coil B will be deenergized, and normally closed contacts El will return to their normally closed state.
  • Main relay operating coil C is still energized at this time, and timer operating coil T will receive current through contacts Cl and E1, starting a predetermined timing cycle.
  • timer operating coil T will receive current through contacts Cl and E1, starting a predetermined timing cycle.
  • contacts Tl will close and T2 will open.
  • Contacts T1 could restore the operating circuit for motor relay operating coil A but for the still opened stop-motion relay contacts F1 because the stop-motion device contacts retain the energized condition of coils F and D.
  • contacts C2 are open since operating coil C is deenergized through opening of contacts T2, while contacts D2 are open. Consequently, the machine will be permanently shut down until restarted manually as in the case of the usual manual starting circuit. That is, after operating coil C is deenergized at the end of the timing cycle, subsequent opening of the stop-motion device contacts will not restart the machine.
  • the stop-motion device contacts will open and contacts D2 and F1 will return to their normally closed state before the end of the timing cycle. Then, when timer contacts T2 open, contacts D2 will'have closed and main control relay coil will remain energized. Consequently, timer contacts T1 can recomplete the circuit for motor operating coil A through main control relay contacts C2, which have remained closed, and contacts Fl which have returned to their normally closed condition as mentioned. Consequently, the machine will automatically restart in the instance of a temporary tension irregularity for which machine shutdown is not required.
  • switch S1 opening of switch S1 will allow the apparatus to operate in the conventional mode, i.e., wherein any operation of one of the stop-motion devices will shut down the machine.
  • the main control relay C operates as a memory device and remains energized for a period of time after operation of a stop-motion device.
  • the main control relay C remains thus energized until the period of timer T is complete, and then main control relay C will be deenergized if the tension irregularity remains. In that event, the machine will have to be inspected by an operator for correcting the yarn tension, and the machine will be manually restarted.
  • the false stops usually associated with minor irregularities will not require any attention of the operator and a manual restart.
  • the main control relay C indicates the motor has been started but has been shut down, thereby providing a circuit through contacts C1 for operating the timer.
  • the tension is tested after a predetermined time and the machine restarted if the tension is correct, while the machine is shutdown and requires manual restart if the tension is incorrect at such time.
  • the present apparatus is described particularly in connection with a knitting machine, it will be realized the same is applicable to other apparatus including a start-stop system and a stop-motion device which indicates incorrect conditions for which shutdown is normally desired.
  • the apparatus according to the present invention is particularly applicable to apparatus employing thread or yarn tension means.
  • an automatic restart circuit comprising:
  • timing means also actuated in response to actuation of said stop-motion device for automatically reinitiating motion of said apparatus after a predetermined time
  • an automatic restart circuit comprising:
  • control means actuated when said start-stop system is actuated and by means of which said motive means is actuated, said control means retaining a particular condition after a starting operation of said start-stop system
  • timing means actuated upon deactivation of said motive means and thereupon automatically changing said condition of said control means after a predetermined period of time if the changed state of said stop-motion device remains the same.
  • timing means further includes means for reactuating said motive means after said predetermined period of time if the last mentioned state of said stop-motion device has changed.
  • stop-motion means responsive to a condition of said fibers for breaking a first energizing circuit to the main control relay as well as a circuit to the motor relay for stopping the motor
  • timer means energized when the motor is deenergized, said timer means having contacts for breaking a second circuit to the main control relay after a predetermined period of time for thereby deenergizing the main control relay if the stop-motion means is still activated,
  • timer means having further contacts for startin' the motor relay after a predetermined period of time if the stop-motion means is no longer activated.
  • said starting means comprises a relay having contacts for initially energizing said main control relay and for initially energizing said motor relay, said last two mentioned relays also having holding contacts.
  • a control circuit comprising:
  • main control relay energizable through the contacts of said starting relay and having holding contacts for maintaining said main control relay in operation, said main control relay having further contacts,
  • a motor relay for energizing said motive means ener-' gizable through the contacts of said starting relay in combination with said further contacts of said control relay
  • stop-motion device operating contacts in circuit with said motor relay for deenergizing the same and in circuit with said main control relay
  • timer means operable when said motive means is deenergiz ed for deenergizing said main control relay after a predetermined time unless said stopmotion device has changed conditions, said timer means having contacts for energizing said motor relay in combination with said stop-motion device operating contacts in circuit with said motor relay.
  • a starting relay in series with a start button as well as normally closed contacts associated with said stopmotion device and normally closed contacts operable for opening upon energization of the controlled motor
  • a main control relay in series with contacts on said starting relay, said control relay having holding contacts for maintaining energization thereof, said main control relay completing its circuit through further normally closed contacts controlled by said stop-motion device,
  • a motor relay adapted to be energized through contacts of said starting relay, contacts of said control relay, and normally closed contacts associated with said stop-motion device in series, said motor relay having holding contacts disposed in parallel with contacts of said starting relay,
  • timing relay adapted to be energized via the first mentioned contacts of said main control relay in series with contacts open when said motor is operating, said timing relay having first contacts in parallel with contacts of said starting relay, and having contacts in parallel with said normally closed contacts controlled by said stop-motion device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00260768A 1972-06-08 1972-06-08 Automatic restart circuit for knitting machines and the like Expired - Lifetime US3735147A (en)

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Application Number Priority Date Filing Date Title
US26076872A 1972-06-08 1972-06-08

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US3735147A true US3735147A (en) 1973-05-22

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US (1) US3735147A (it)
JP (1) JPS4961456A (it)
CA (1) CA996232A (it)
CH (1) CH587372A5 (it)
DE (1) DE2329187A1 (it)
GB (1) GB1433145A (it)
IT (1) IT985930B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138631A (en) * 1977-12-21 1979-02-06 West Point Pepperell, Inc. Drop wire circuit tester
EP0799678A3 (en) * 1996-04-03 1998-01-21 Hewlett-Packard Company Multiple impact motor drive for stapling

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6141352A (ja) * 1984-07-27 1986-02-27 株式会社　都ニツト 編機における原糸の結び目による編地の穴明き防止装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US432040A (en) * 1890-07-15 hasla m
US1627292A (en) * 1926-04-23 1927-05-03 Harry E Matthews Electric stop motion for textile machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US432040A (en) * 1890-07-15 hasla m
US1627292A (en) * 1926-04-23 1927-05-03 Harry E Matthews Electric stop motion for textile machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138631A (en) * 1977-12-21 1979-02-06 West Point Pepperell, Inc. Drop wire circuit tester
EP0799678A3 (en) * 1996-04-03 1998-01-21 Hewlett-Packard Company Multiple impact motor drive for stapling

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Publication number Publication date
DE2329187A1 (de) 1974-01-03
CH587372A5 (it) 1977-04-29
JPS4961456A (it) 1974-06-14
GB1433145A (en) 1976-04-22
IT985930B (it) 1974-12-30
CA996232A (en) 1976-08-31

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